Dejun Wang

Publications (45)131.87 Total impact

• Article: The Effect of Photogenerated Charge Transfer on the Photocatalysis in High-performance Hybrid Pt-Co:ZnO Nanostructure photocatalyst.

  Yongchun Lu, Yanhong Lin, Tengfeng Xie, Liping Chen, Shasha Yi, Dejun Wang
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  ABSTRACT: Hybrid Pt-Co:ZnO nanostructure photocatalysts were prepared via a facile two-step synthetic strategy. SPS and TPV investigations demonstrate the existence of the synergetic effect between Pt and Co dopants. Such synergetic effect could make use of visible photons as well as facilitates the separation of photogenerated charges to prevent recombination, effectively prolongating the charges lifetime to participate photocatalytic reaction. The synergetic effect exist in Pt-Co:ZnO inducing as high as 7.7-fold in photovoltaic response and 10-fold in the photo-activity for hybrids compared to Co:ZnO.
  ACS Applied Materials & Interfaces 04/2013; · 4.53 Impact Factor
• Article: Carrier concentration-dependent electron transfer in Cu2O/ZnO nanorod arrays and their photocatalytic performance.

  Tengfei Jiang, Tengfeng Xie, Liping Chen, Zewen Fu, Dejun Wang
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  ABSTRACT: In this paper, we have engineered the interface electronic structure in Cu2O/ZnO nanorod arrays, via adjusting the carrier concentration of Cu2O, and applied them to photocatalysis. The photoinduced charge transfer kinetics at the interface between Cu2O and ZnO were systematically investigated. The Cu2O (pH 11.0)/ZnO nanorod arrays have the largest magnitude of interfacial electric field, and photoinduced charge carriers can be separated rapidly and efficiently, which generates the highest photocatalytic efficiency for the reduction of methylviologen. Heterojunction construction is an exciting direction to pursue for highly active photocatalysts, and also offers opportunities to investigate the relationship between the electronic structure and the photocatalytic performance.
  Nanoscale 03/2013; · 5.91 Impact Factor
• Article: Photoelectrical properties of Ag(2)S quantum dot-modified TiO(2) nanorod arrays and their application for photovoltaic devices.

  Bingkun Liu, Dejun Wang, Yu Zhang, Haimei Fan, Yanhong Lin, Tengfei Jiang, Tengfeng Xie
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  ABSTRACT: Vertically aligned TiO(2) nanorod arrays (NRAs) modified with Ag(2)S quantum dots (QDs) have been successfully prepared via a successive ionic layer adsorption and reaction (SILAR) process. Ultraviolet-visible (UV-vis) absorption spectra and surface photovoltage (SPV) measurements reveal that the Ag(2)S sensitization extends the range of the photoresponse of the TiO(2) NRAs to the visible region and exhibits higher photovoltage responses. With a polysulfide electrolyte, a maximum conversion efficiency of 0.148% with a superior J(sc) of 1.177 mA cm(-2) are obtained after 6 SILAR cycles under illumination at 100 mW cm(-2). These results indicate that the Ag(2)S QDs/TiO(2) NRAs photoelectrode has a promising application in solar cells.
  Dalton Transactions 11/2012; · 3.84 Impact Factor
• Article: Enhancement of visible-light-driven photoresponse of Mn/ZnO system: photogenerated charge transfer properties and photocatalytic activity.

  Yongchun Lu, Yanhong Lin, Tengfeng Xie, Shoulei Shi, Haimei Fan, Dejun Wang
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  ABSTRACT: A visible-light-active ZnO photocatalyst system in the presence of manganese ions (Mn/ZnO) was prepared via a simple and rapid approach. XRD, XPS, Raman scattering and UV-Vis DRS confirmed the manganese exists in multivalent forms (Mn(3+)/Mn(2+)) in the ZnO lattice, furthermore, ZnO light absorption is extended to the visible region. The photocatalytic activities of the catalysts were evaluated by measuring the photodegrading efficiency of 2,4-dichlorophenol (DCP) under visible light irradiation. With an optimal molar ratio of 5% in Mn/ZnO the highest rate photodegradation was achieved under the experimental conditions. We have characterized the separation and transfer behavior of the photogenerated charges in the visible region by means of surface photovoltage (SPV), surface photocurrent (SPC) and transient photovoltage (TPV) techniques. Based on the comprehensive investigation of the photovoltaic properties of Mn/ZnO photocatalyst, we illustrate the behavior of photogenerated charges have distinct effects on the photocatalytic activity. It is demonstrated that the incorporation of multivalent Mn in ZnO promoted the separation of photogenerated charges, inhibited the recombination of photogenerated carriers, and thus prolonged the charges lifetime to participate in the photocatalytic reaction, resulting in highly efficient photocatalytic activity, which is attributed to the formation of a strong electronic interaction between the multivalent Mn and ZnO.
  Nanoscale 09/2012; 4(20):6393-400. · 5.91 Impact Factor
• Article: Photoinduced Charge Transfer Properties and Photocatalytic Activity in Bi(2)O(3)/BaTiO(3) Composite Photocatalyst.

  Haimei Fan, Haiyan Li, Bingkun Liu, Yongchun Lu, Tengfeng Xie, Dejun Wang
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  ABSTRACT: A series of Bi(2)O(3)/BaTiO(3) composite photocatalysts with different mass ratios of Bi(2)O(3) vs BaTiO(3) were prepared by an impregnating-annealing method. X-ray diffraction (XRD), high-resolution transmission electron microscopic (HRTEM), and UV-vis diffuse reflection spectroscopy (DRS) confirmed that Bi(2)O(3) and BaTiO(3) coexisted in the composites. The results of surface photovoltage (SPV) experiments showed enhancements of photovoltaic response in composites, which indicated a higher separation efficiency of photoinduced charges due to the establishment of an efficient interfacial electric field between Bi(2)O(3) and BaTiO(3) in the composites. The consistency of phtocatalytic activity and photovoltaic response intensity of photocatalysts showed that the efficiency interfacial electric field between Bi(2)O(3) and BaTiO(3) played an important role in improving the degradation efficiency of Rhodamine B (RhB). The 60%-Bi(2)O(3)/BaTiO(3) sample with the best activity was found by optimizing the mass ratios of Bi(2)O(3) vs. BaTiO(3). On the basis of the work function (WF) measurements, a reasonable energy band diagram was proposed for BaTiO(3)/Bi(2)O(3) composite. It would be helpful in designing and constructing high efficiency heterogeneous semiconductor photocatalyst.
  ACS Applied Materials & Interfaces 08/2012; 4(9):4853-7. · 4.53 Impact Factor
• Article: Synthesis of ordered multivalent Mn-TiO2 nanospheres with tunable size: A high performance visible-light photocatalyst

  Haiyan Li, Dejun Wang, Haimei Fan, Tengfei Jiang, Xinglin Li, Tengfeng Xie
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  ABSTRACT: A facile and reproducible method has been developed for the synthesis of ordered anatase Mn-TiO2 nanospheres with controllable sizes in the range 200–300 nm by simply varying the amount of manganese(II) chloride added. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and transmission electron microscope (TEM) measurements, and it was found that the manganese exists in multivalent forms (Mn4+/ Mn3+) and substitutes for some of the Ti4+ in the anatase TiO2 lattice. The presence of Mn significantly influences the morphology and high-temperature stability of TiO2, and extends its light absorption range. Surface photovoltage and photocurrent measurements revealed that an electronic interaction between the Mn and TiO2 was present, in which Mn served as an electron acceptor and effectively inhibited the charge recombination in TiO2; this is thought to be responsible for the highly efficient photocatalytic activity of the material in the degradation of rhodamine B (RhB) under visible-light irradiation ( λ > 420 nm). KeywordsMultivalent–Mn-TiO2 –nanosphere–photocatalysis–electron acceptor
  Nano Research 04/2012; 4(5):460-469. · 6.97 Impact Factor
• Source

  Available from: nanoarchive.org

  Article: One-step, solvothermal synthesis of graphene-CdS and graphene-ZnS quantum dot nanocomposites and their interesting photovoltaic properties

  Ping Wang, Tengfei Jiang, Chengzhou Zhu, Yueming Zhai, Dejun Wang, Shaojun Dong
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  ABSTRACT: The synthesis of graphene-semiconductor nanocomposites has attracted increasing attention due to their interesting optoelectronic properties. However the synthesis of such nanocomposites, with decorated particles well dispersed on graphene, is still a great challenge. This work reports a facile, one-step, solvothermal method for the synthesis of graphene-CdS and graphene-ZnS quantum dot nanocomposites directly from graphene oxide, with CdS and ZnS very well dispersed on the graphene nanosheets. Photoluminescence measurements showed that the integration of CdS and ZnS with graphene significantly decreases their photoluminescence. Transient photovoltage studies revealed that the graphene-CdS nanocomposite exhibits a very unexpected strong positive photovoltaic response, while separate samples of graphene and CdS quantum dots (QDs) of a similar size do not show any photovoltaic response. KeywordsGraphene-CdS-ZnS-quantum dots-charge transfer-photovoltaic
  Nano Research 04/2012; 3(11):794-799. · 6.97 Impact Factor
• Article: Technical scheme and optimization of precision timing and synchronization for underwater systems.

  Yu Chen, Haibin Wang, Xi Chen, Dejun Wang
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  ABSTRACT: Real time base is one of the key features for underwater systems. However, time bias accumulates inevitably in a long-term unattended underwater system, even if high precision oscillators are used. Since it's difficult for underwater equipments to obtain timing information directly from GPS satellites, there's demanding need for effective ways of timing services. In this paper, a technical scheme based on Precision Time Protocol and virtual instruments is given. Timing and synchronization services are provided from remote time server to underwater systems. Technical optimizations are made considering the requirements of practical applications. The optimized solution has been equipped in a practical system. Experiments show it's easy to implement and with high precision, good stability and efficiency.
  The Journal of the Acoustical Society of America 04/2012; 131(4):3486. · 1.55 Impact Factor
• Source

  Available from: canli.dicp.ac.cn

  Article: Effect of BiVO4 Crystalline Phases on the Photoinduced Carriers Behavior and Photocatalytic Activity

  Haimei Fan, Tengfei Jiang, Haiyan Li, Dejun Wang, Lingling Wang, Jiali Zhai, Dongqing He, Ping Wang, Tengfeng Xie
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  ABSTRACT: A series of different crystalline phases BiVO4 photocatalysts (tetragonal, monoclinic, and monoclinic/tetragonal heterophase) have been prepared by a coprecipitation and molten salt method. High-resolution transmission electron microscopy (HRTEM) results show that an interface of intimate contact is formed in monoclinic/tetragonal heterophase and monoclinic phase is mainly on the surface of nanoparticles. Surface photovoltage (SPV) and transient photovoltage (TPV) techniques are used to further investigate the transfer process of photoinduced charge carriers. The results show that the behavior of photoinduced charges markedly depend on the crystalline phases of BiVO4 samples, and the presence of interface in monoclinic/tetragonal heterophase provides a spatial condition for charge transfer, promotes the separation of photoinduced electron–hole pairs, and changes the migration direction of photoinduced carriers. The relationship between behavior of photoinduced charge carriers and photocatalytic activity was discussed in detail, which would provide a greater insight into the intrinsic reasons of the enhancement in photocatalytic activity.
  01/2012;
• Article: Visible-Light-Assisted HCHO Gas Sensing Based on Fe-Doped Flowerlike ZnO at Room Temperature

  Lina Han, DeJun Wang, Yongchun Lu, Tengfei Jiang, Bingkun Liu, Yanhong Lin
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  ABSTRACT: In this work, Fe-doped flowerlike ZnO powders with various doping contents were successfully fabricated by a hydrothermal method. The results of X-ray diffraction and UV–vis DRS spectra revealed that the Fe ions have been successfully doped into the crystal lattice of the ZnO host structure, and the optical absorption response of Fe-doped ZnO was extended into the visible region for the incorporation of Fe ions. The room-temperature photoelectric gas sensing of formaldehyde (HCHO) based on the Fe-doped ZnO was also studied under 532 nm light irradiation provided by a green laser pointer. It was found that the as-prepared Fe-doped ZnO samples showed excellent sensitivity, in which the gas response to 5 and 100 ppm formaldehyde can reach to 22% and 287% under 532 nm light irradiation at room temperature, respectively. The sensing mechanism of the obvious visible-light-induced photoelectric gas sensing was discussed with the help of surface photovoltage measurement. Our results demonstrated that visible light irradiation was a promising approach to achieving a large response for gas sensors at room temperature. This work will pave a way for the development of a low-cost practical gas sensor.
  10/2011;
• Article: Investigation of photocatalytic activities over Bi₂WO₆/ZnWO₄ composite under UV light and its photoinduced charge transfer properties.

  Dongqing He, Lingling Wang, Dandan Xu, Jiali Zhai, Dejun Wang, Tengfeng Xie
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  ABSTRACT: Bi(2)WO(6)/ZnWO(4) composite photocatalysts have been successfully synthesized by a facile hydrothermal process. The catalysts were characterized by powder X-ray diffraction (XRD), transmission electron microcopy (TEM), and UV-vis diffuse reflectance spectrum (DRS). The results show that Bi(2)WO(6) nanoparticles grow on the primary ZnWO(4) nanorods. The Bi(2)WO(6)/ZnWO(4) composites have better UV light photocatalytic activities compared to single ZnWO(4) nanorods. Furthermore, the photoinduced charge transfer properties of Bi(2)WO(6)/ZnWO(4) composites were investigated by means of transient photovoltage (TPV) technique in detail. The interconnected interface of Bi(2)WO(6)/ZnWO(4) composites led to the low recombination ratios of photoinduced electron-hole pairs and enhanced photocatalytic activities.
  ACS Applied Materials & Interfaces 08/2011; 3(8):3167-71. · 4.53 Impact Factor
• Article: Rutile TiO2 nanowires on anatase TiO2 nanofibers: a branched heterostructured photocatalysts via interface-assisted fabrication approach.

  Changhua Wang, Xintong Zhang, Changlu Shao, Yanli Zhang, Jikai Yang, Panpan Sun, Xueping Liu, Hong Liu, Yichun Liu, Tengfeng Xie, Dejun Wang
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  ABSTRACT: A water-dichloromethane interface-assisted hydrothermal method was employed to grow rutile TiO(2) nanowires (NWs) on electrospun anatase TiO(2) nanofibers (NFs), using highly reactive TiCl(4) as precursor. The water-dichloromethane interface inhibited the formation of rutile NWs in water phase, but promoted the selective radial growth of densely packed rutile NWs on anatase NFs to form a branched heterojunction. The density and length of rutile NWs could be readily controlled by varying reaction parameters. A formation mechanism for the branched heterojunction was proposed which involved (1) the entrapment of rutile precursor nanoparticles at water-dichloromethane interface, (2) the growth of rutile NWs on anatase NFs via Ostwald ripening through the scavengering of interface-entrapped rutile nanoparticles. The heterojunction formed at anatase NF and rutile NW enhanced the charge separation of both under ultraviolet excitation, as evidenced by photoluminescence and surface photovoltage spectra. The branched TiO(2) heterostructures showed higher photocatalytic activity in degradation of rodamine B dye solution than anatase NFs, and the mixture of anatase NFs, and P25 powders, which was discussed in terms of the synergistic effect of enhanced charge separation by anatase-rutile heterojunction, high activity of rutile NWs, and increased specific area of branched heterostructures.
  Journal of Colloid and Interface Science 07/2011; 363(1):157-64. · 3.07 Impact Factor
• Article: Surface charge transfer properties of high-performance Ag-decorated ZnO photocatalysts

  Yongchun Lu, Yanhong Lin, Dejun Wang, Lingling Wang, Tengfeng Xie, Tengfei Jiang
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  ABSTRACT: Silver-decorated ZnO (Ag/ZnO) chain-like nanoparticle aggregates were prepared by a facile nonaqueous sol–gel method. The influence of Ag decoration on the surface photo-induced charge transfer behaviour of ZnO was investigated by means of surface photovoltage spectroscopy, electric field-induced surface photovoltage spectroscopy and transient photovoltage techniques. The photovoltage spectra revealed that an electronic interaction between Ag and ZnO formed. Ag acted as electron acceptors and effectively inhibited the charge recombination in ZnO with UV light illumination, while under the illumination of visible light a redshift was observed due to the appearance of a plasmon-induced band resulting from the formation of Ag nanoparticle clusters. These were responsible for the significant enhancement in the photocatalytic activity of the Ag/ZnO sample. The results also suggested that the high-performance visible light photocatalytic activity could be manipulated by external biases.
  Journal of Physics D Applied Physics 07/2011; 44(31):315502. · 2.54 Impact Factor
• Article: Enhancement of gas sensing properties of CdS nanowire/ZnO nanosphere composite materials at room temperature by visible-light activation.

  Jiali Zhai, Lingling Wang, Dejun Wang, Haiyan Li, Yu Zhang, Dong Qing He, Tengfeng Xie
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  ABSTRACT: CdS nanowire/ZnO nanosphere materials (CdS/ZnO) with hierarchical structure were synthesized by a three-step solvothermal process. XRD, FESEM and TEM analysis confirmed the growth of ZnO nanospheres on the surface of CdS nanowires (NWs). The transient photovoltage (TPV) measurements revealed that the interface between CdS and ZnO can inhibit the recombination of photogenerated excess carriers and prolong the lifetime of excess carriers in CdS/ZnO materials. Moreover, the CdS/ZnO materials exhibit a dramatic improvement in optoelectronic performance and visible-light-irradiation gas sensing activity, which gave 1 order of magnitude larger than that of CdS NWs in response to formaldehyde. The enhancement of sensing properties is attributed to the interfacial transport of excess carriers.
  ACS Applied Materials & Interfaces 05/2011; 3(7):2253-8. · 4.53 Impact Factor
• Article: Effect of Heterojunction on the Behavior of Photogenerated Charges in Fe3O4@Fe2O3 Nanoparticle Photocatalysts

  Xiao Wei, Tengfeng Xie, Linlin Peng, Wei Fu, Jiesheng Chen, Qian Gao, Guangyan Hong, Dejun Wang
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  ABSTRACT: The behavior of photogenerated charges in the Fe3O4@Fe2O3 core/shell nanoparticles with high photocatalytic activity have been investigated by surface photovoltage (SPV) spectroscopy and transient photovoltage (TPV) measurements. The single-phase Fe3O4 and Fe2O3 particles as references have been investigated simultaneously. The results demonstrate that the junction formation in the Fe3O4@Fe2O3 nanoparticles significantly affects the separation, transport, and recombination of photogenerated charges and even changes the transport direction and recombination velocity. And the mechanisms here have been discussed in detail. These results are helpful in understanding the photoelectric process of nanoscaled materials with the heterojunction structures and further utilizing the photoelectric materials and devices.
  04/2011;
• Article: Dye-sensitized solar cells based on TiO2-B nanobelt/TiO2 nanoparticle sandwich-type photoelectrodes with controllable nanobelt length.

  Youzhen Dong, Kai Pan, Guohui Tian, Wei Zhou, Qingjiang Pan, Tengfeng Xie, Dejun Wang, Honggang Fu
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  ABSTRACT: The TiO(2)-B nanobelt (NB)/TiO(2) nanoparticle (NP) sandwich-type structure photoelectrode, with controllable nanobelt length, has been used to fabricate high-efficiency dye-sensitized solar cells (DSSCs), which combine the advantages of the rapid electron transport in TiO(2)-B NBs and the high surface area of TiO(2) NPs. The results indicate that the sandwich-type photoelectrode achieves higher photoelectrical conversion efficiency when compared with the TiO(2) nanoparticulate electrode. Increasing the length of TiO(2)-B NBs has been demonstrated to improve the photoelectric conversion efficiency (η). DSSCs with the longest (10 μm) TiO(2)-B NBs yield the highest η of 7.94%. The interfacial electron transport of DSSCs with different lengths of TiO(2)-B NBs has been quantitatively investigated using the photovoltage transient and the electrochemical impedance spectra, which demonstrates that the DSSCs with longest TiO(2)-B NBs display the highest electron collection efficiency and the fastest interfacial electron transfer.
  Dalton Transactions 03/2011; 40(15):3808-14. · 3.84 Impact Factor
• Article: Synthesis of reduced graphene oxide-anatase TiO2 nanocomposite and its improved photo-induced charge transfer properties.

  Ping Wang, Yueming Zhai, Dejun Wang, Shaojun Dong
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  ABSTRACT: The construction of reduced graphene oxide or graphene oxide with semiconductor has gained more and more attention due to its unexpected optoelectronic and electronic properties. The synthesis of reduced graphene oxide (RGO) or graphene oxide-semiconductor nanocomposite with well-dispersed decorated particles is still a challenge now. Herein, we demonstrate a facile method for the synthesis of graphene oxide-amorphous TiO(2) and reduced graphene oxide-anatase TiO(2) nanocomposites with well-dispersed particles. The as-synthesized samples were characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV-Vis absorption spectroscopy, Fourier transform infrared spectrometry, and thermogravimetric analysis. The photovoltaic properties of RGO-anatase TiO(2) were also compared with that of similar sized anatase TiO(2) by transient photovoltage technique, and it was interesting to find that the combination of reduced graphene oxide with anatase TiO(2) will significantly increase the photovoltaic response and retard the recombination of electron-hole pairs in the excited anatase TiO(2).
  Nanoscale 02/2011; 3(4):1640-5. · 5.91 Impact Factor
• Article: Facile synthesis of TiO2(B) crystallites/nanopores structure: a highly efficient photocatalyst.

  Ping Wang, Tengfeng Xie, Dejun Wang, Shaojun Dong
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  ABSTRACT: TiO(2)(B) was prepared by a facile green solvothermal method and further characterized by the powder X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), raman spectroscopy and nitrogen sorption analysis, and it has been found that the as-synthesized sample possesses a unique crystallites/nanopores structure and has a very large surface area (484 m(2) g(-1)). Surprisingly, it exhibits the very high photocatalytic activity and good stability for the decomposition of methyl orange (MO) compared to that of P25.
  Journal of Colloid and Interface Science 10/2010; 350(2):417-20. · 3.07 Impact Factor
• Article: Photoinduced charge transfer in ZnO/Cu(2)O heterostructure films studied by surface photovoltage technique.

  Tengfei Jiang, Tengfeng Xie, Yu Zhang, Liping Chen, Linlin Peng, Haiyan Li, Dejun Wang
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  ABSTRACT: ZnO/Cu(2)O heterostructure films were prepared by a two-step electrodeposition method in aqueous solution on fluorine-doped tin oxide (FTO) substrates. Scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and UV-vis transmission measurements were utilized to characterize the films. Surface photovoltage (SPV) technique was used to investigate the process of photoinduced charge transfer. The results show that there is an electric field located at the interface between ZnO and Cu(2)O film and the photoinduced electrons in Cu(2)O film inject into ZnO under the effect of interfacial electric field with visible light irradiation. While under ultraviolet light illumination, the photoinduced electrons in Cu(2)O film accumulate at the surface of Cu(2)O film instead of injecting into ZnO under the action of surface built-in electric field of Cu(2)O film. The work function measurements confirm that the direction of interfacial electric field is from ZnO to Cu(2)O. These results are help to future design of high performance heterostructure photovoltaic devices.
  Physical Chemistry Chemical Physics 10/2010; 12(47):15476-81. · 3.57 Impact Factor
• Article: Synthesis of highly efficient C-doped TiO(2) photocatalyst and its photo-generated charge-transfer properties.

  Haiyan Li, Dejun Wang, Haimei Fan, Ping Wang, Tengfei Jiang, Tengfeng Xie
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  ABSTRACT: Carbon-doped anatase TiO(2) was prepared by a facile hydrothermal process without adding additional carbon source. The as-prepared sample shows highly efficient photocatalytic activity, which only requires 4min and is about 11 times higher than that of Degussa P25 TiO(2) in degradation of methyl orange (MO) dye under UV light irradiation. Moreover, a highly visible-light activity is also observed. UV-vis diffuse reflectance spectra and X-ray photoelectron spectroscopy confirm that the carbon atoms are incorporated into the interstitial positions of TiO(2) lattice and form a strong interaction with titanium atoms and extend photoresponding range to 700nm. Surface photovoltage spectra (SPS) and transient photovoltage (TPV) suggest that the presence of interstitial carbons induce several localized occupied states in the gap, enhance the separation extent and restrain the recombination of the photo-induced electron and hole carriers in TiO(2).
  Journal of Colloid and Interface Science 10/2010; 354(1):175-80. · 3.07 Impact Factor