Tianquan Lin

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (27)129.72 Total impact

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    ABSTRACT: Three-dimensional elastic macroscopic graphene network (3D-GN) is prepared with the assistance of porous SiO2 ceramic substrates by using ambient pressure chemical vapor deposition, which is suitable for thermal management application. The free standing elastic macroscopic 3D-GN possesses excellent electrical, mechanical and thermal transfer properties.
    J. Mater. Chem. A. 09/2014;
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    ABSTRACT: Black titania nanotube arrays are prepared for the first time by the melted aluminium reduction of pristine anodized and air-annealed titania nanotube arrays. The black titania nanotubes with substantial Ti3+ and oxygen vacancies exhibit an excellent photoelectrochemical water-splitting performance due to the improved charge transport and separation and the extended visible light response. An impressive applied bias photon-to-current efficiency of 1.20% is achieved.
    J. Mater. Chem. A. 05/2014; 2(23).
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    ABSTRACT: We report a new rapid household microwave method to successfully grow graphene on h-BN flakes without using any catalysts. We obtained a novel uniform multi-level matrix of vertical graphene sheets on h-BN flakes. The unique structure possessed outstanding electron conductivity and thermal properties (29.1 W m-1 K-1).
    ACS Applied Materials & Interfaces 02/2014; · 5.01 Impact Factor
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    ABSTRACT: Directional heat transfer can provide an efficient way for thermal management in thermal transfer, thermal energy storage, etc. A novel growth method is proposed to synthesize continuous graphene films on insulating substrates by Ni-assisted chemical vapor deposition (CVD) at relatively low temperature down to 800 °C. Uniformly dispersed Ni nanoparticles on ceramic substrates play an important role of capturing carbon atoms and accelerating the nucleation to grow high quality graphene rooted on insulating ceramic substrates (anodic aluminum oxide, cordierite). The graphene species consist of 1D isolated graphene tubes coated on AAO, which can act as the media for directional thermal transport. The graphene/Ni/cordierite composite contains an interconnected macroporous graphene framework with a low sheet electrical resistance down to 8.6 Ω sq−1 and thermal conductivity of 4.17 W m−1 K−1. The porous graphene/Ni/cordierite composite can hold phase change materials (wood's alloy) to construct efficient thermal energy storage devices due to its high thermal conductivity, which can be used as heat sinks in thermoelectric devices. This work displays the great potential of CVD direct growth of graphene on insulating porous substrates for directional heat conduction, thermal management and thermoelectric applications.
    J. Mater. Chem. A. 01/2014; 2(7).
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    ABSTRACT: Graphene/ceramic composites are proposed by directly depositing graphene on the insulating Al2O3 particles by chemical vapor deposition without any metal catalysts. Carbothermic reduction occurring at the Al2O3 surface is vital during the initial stage of graphene nucleation and the graphene sheet can connect with neighboring sheets to completely cover Al2O3 particles. The quality and layer number of graphene on Al2O3 can be finely tailored by changing the growth temperature and gas ratio. Graphene coated Al2O3 (G-Al2O3) composites are used as effective fillers of stearic acid (SA) to increase the thermal transport property. By the optimization of the layer number of graphene, size of Al2O3 particles and ratio of G-Al2O3/SA in a quantitative, their thermal conductivities significantly increase up to 11 folds from 0.15 to 1.65 W m−1 K−1. The great improvement is attributed to the high thermal transfer performance of graphene and excellent wettability between graphene and SA. When the G-Al2O3/SA composites with the graphene coated porous Al2O3 foam, the thermal conductivity further reaches to 2.39 W m−1 K−1, and the corresponding latent heat is 38 J g−1. It demonstrates the potential applications of graphene in thermal transport and thermal energy storage devices.
    Carbon. 01/2014; 75:314–321.
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    ABSTRACT: Direct growth of graphene on Al2O3 film is successfully achieved assisted with NiAl2O4 film on a SiO2 substrate by chemical vapor deposition at 800 °C. The Ni particles are first uniformly separated out on the substrate, and play an important role in capturing carbon atoms and accelerating the nucleation to grow high quality graphene rooting on insulating Al2O3 film. The thickness of graphene films can be tuned from two layers to few layers (<10) by changing growth time. The continuous graphene films exhibit extremely excellent electrical transport properties with a sheet resistance of down to 18.5 Ω sq−1. The graphene/Ni/Al2O3/SiO2 is used as the counter electrode of dye sensitized solar cell which achieves a photovoltaic efficiency of 7.62%.
    Carbon. 01/2014; 71:20–26.
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    ABSTRACT: Anatase TiO2 is one of the most important energy materials, but suffers from poor electrical conductivity. Nb-doping has been considered as an effective way to improve its performance in the applications of photocatalysis, solar cells, Li batteries and transparent conducting oxide films. Here, we report the further enhancement of electron transport in Nb-doped TiO2 nanoparticles via pressure-induced phase transitions. The phase transition behavior and influence of Nb-doping in anatase Nb-TiO2 are systematically investigated by in situ synchrotron X-ray diffraction and Raman spectroscopy. The bulk moduli are determined to be 179.5, 163.3, 148.3 and 139.0 GPa for 0, 2.5, 5.0 and 10.0 mol% Nb-doped TiO2, respectively. The Nb-concentration-dependent stiffness variation is demonstrated that the sample with higher Nb concentration has lower stiffness. In situ resistance measurement reveals an increase of 40% in conductivity of quenched Nb-TiO2 compared to the pristine anatase phase. The pressure-induced conductivity evolution is discussed detailedly in terms of the packing factor model, which provides a direct evidence for the rationality of packing factor correlated with electron transport in semiconductors. Such pressure-treated Nb-doped TiO2 with unique properties surpassing those in anatase phase hold great promise for energy-related applications.
    Journal of the American Chemical Society 12/2013; · 10.68 Impact Factor
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    ABSTRACT: Modification of rutile titanium dioxide (TiO</sub>2<sub>) for hydrogen generation and water cleaning is a grand challenge due to the chemical inertness of rutiles, while such inertness is a desired merit for its stability in photoelectrochemical applications. Herein, we report an innovative two-step method to prepare a core-shell nanostructured S-doped rutile TiO</sub>2<sub> (R'-TiO</sub>2<sub>-S). This modified black rutile TiO</sub>2<sub> sample exhibits remarkably enhanced absorption in visible and near infrared regions and efficient charge separation and transport. As a result, the unique sulfide surface (TiO</sub>2-x<sub>:S) boosts the photocatalytic water cleaning and water splitting with a steady solar hydrogen production rate of 0.258 mmol h</sup>-1<sup> g</sup>-1<sup>. The black titania is also an excellent photoelectrochemical (PEC) electrode exhibiting a high solar-to-hydrogen conversion efficiency of 1.67 %. The sulfided surface shell is proved to be an effective strategy for enhancing solar light absorption and photoelectric conversion.
    Journal of the American Chemical Society 10/2013; · 10.68 Impact Factor
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    ABSTRACT: Not always black and white: Gray TiO2 nanowires with high photocatalytic activity have been successfully synthesized by aluminum-mediated reduction in a two-zone furnace. These wires, which possess a core (TiO2-x )/shell (TiO2 ) structure, exhibit visible-light and even IR absorption with high photocatalytic activity, far exceeding that of commercial Degussa P25. They show high stability in air and water under solar-light irradiation.
    Chemistry 09/2013; · 5.93 Impact Factor
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    ABSTRACT: Black platelike brookite with outstanding photocatalytic performance is prepared by constructing a distinct crystalline core/disordered shell structure (TiO2@TiO2−x) through aluminium reduction. Many oxygen vacancies and Ti3+ states are introduced into the distorted shell, which increase the solar energy absorption and boost the photocatalytic activity.
    J. Mater. Chem. A. 08/2013; 1(34).
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    ABSTRACT: The composite substrate of Co and Cu was proposed to grow homogenous high quality wafer-size graphene films by an atmosphere pressure CVD method. The composite substrate consists of a moderate-carbon-solubility metal top (Co coating) as a C-dissolving layer and a low-carbon-solubility metal base (Cu foil) as a C-rejecting layer. During the CVD process, the interdiffusion of Co and Cu atoms occurs in the composite. With the dynamic control on Co and Cu alloying process to affect the carbon solubility, active carbon atoms captured by the Co layer were segregated to form spontaneously a high-quality graphene film on the top of Cu-Co substrate. The tunable layer-number of the graphene films can be precisely controlled by adjusting the thickness of the Co layer. High quality single-layered graphene films with a 98% yield were prepared on an 80 nm-Co-coated Cu foil and insensitive to growth temperature and time. More importantly, this type of composite substrate has also been developed to grow AB-stacked bilayers and three-layer graphene with 99% surface coverage and absence of defects. The approach is opening up a new avenue for high-quality graphene production with precise layer control through composite substrate design.
    Nanoscale 05/2013; · 6.23 Impact Factor
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    ABSTRACT: A simple and scalable method was proposed to fabricate graphene papers, and the graphene sheets were prepared using conventional chemical vapor deposition (CVD) method. The CVD graphene papers possess much higher electrical conductivity of 1097 S cm−1, compared with other reported carbon-related papers (graphene, carbon nanotube, etc.). The graphene papers have good flexibility with only <5% loss of electrical conductivity after mechanically bending 500 times. Such free-standing graphene papers can replace expensive Pt/FTO counter electrodes of dye-sensitized solar cells with better energy conversion efficiency, and also be used as anodes of lithium ion batteries possessing a superior high-rate capacity and cycling performance. The highly conductive, free-standing and flexible graphene papers reveal potential in high-performance, flexible energy conversion and storage devices.
    RSC Advances 05/2013; 3(22):8454-8460. · 3.71 Impact Factor
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    ABSTRACT: A novel architecture of 3D graphene growth on porous Al2O3 ceramics is proposed for thermal management using ambient pressure chemical vapor deposition. The formation mechanism of graphene is attributed to the carbothermic reduction occurring at the Al2O3 surface to initialize the nucleation and growth of graphene. The graphene films are coated on insulating anodic aluminum oxide (AAO) templates and porous Al2O3 ceramic substrates. The graphene coated AAO possesses one-dimensional isolated graphene tubes, which can act as the media for directional thermal transport. The graphene/Al2O3 composite (G-Al2O3) contains an interconnected macroporous graphene framework with an extremely low sheet electrical resistance down to 0.11 Ω sq−1 and thermal conductivity with 8.28 W m−1 K−1. The G-Al2O3 provides enormous conductive pathways for electronic and heat transfer, suitable for application as heat sinks. Such a porous composite is also attractive as a highly thermally conductive reservoir to hold phase change materials (stearic acid) for thermal energy storage. This work displays the great potential of CVD direct growth of graphene on dielectric porous substrates for thermal conduction and electronic applications.
    Advanced Functional Materials 05/2013; 23(18). · 9.77 Impact Factor
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    ABSTRACT: A new composite structure of graphene–sulfur with a high electrochemical performance is proposed. Scotch-tape-like sulfur-assisted exfoliation of graphite is developed to produce the graphene–sulfur composites and freestanding low-defect graphene sheets. The intimate interaction between sulfur and graphene, attributed to the similar electronegativities of the two elements, is stronger than the van der Waals forces between adjacent π–π stacked graphene layers. This causes cleavage of the graphene layers when the sulfur molecules stick to the surface and edges of the graphite, similar to Scotch tape in micromechanical exfoliation processes. This approach enables us to obtain graphene with an electrical conductivity as high as 1820 S cm−1 and a Hall mobility as high as 200 cm2 V−1 s−1, superior to most reported graphene. Furthermore, the graphene sheets which uniformly anchor sulfur molecules provide a superior confinement ability for polysulfides, sufficient space to accommodate sulfur volumetric expansion, a large contact area with the sulfur and a short transport pathway for both electrons and Li+. The unique structure containing 73 wt.% sulfur exhibits excellent overall electrochemical properties of 615 mA h g−1 at the 1 C (1 C = 1675 mA g−1) rate after 100 cycles (corresponding average Coulombic efficiency of over 96%) and 570 mA h g−1 at 2 C. These encouraging results represent that sulfur molecules bound onto graphene sheets could be a promising cathode material for lithium batteries with a high energy density.
    Energy & Environmental Science 03/2013; 6(4):1283-1290. · 11.65 Impact Factor
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    ABSTRACT: High response to low-concentration Cl2 gas was achieved by a sensor based on octahedral crystals of CdIn2O4 decorated by Au nanoparticles (Au NPs). CdIn2O4 crystals were synthesized in a one-step hydrothermal reaction and Au NPs were functionalized onto CdIn2O4 also in a hydrothermal reaction. Systematic investigations revealed that the Au NPs-decorated CdIn2O4 samples possessed a superior sensing capability, compared with bare CdIn2O4 crystals. The optimal Au NPs loading (2 wt%) resulted in 8.3-fold enhancement in gas response to 1 ppm Cl2 at the working temperature, 190 °C, compared to bare CdIn2O4. The Au NPs on the surface enhanced the sensor response due to the catalytic activity of Au NPs and the strong electronic interaction between Au NPs and CdIn2O4 support. This work provides a promising approach for fabricating such a hybrid structure with excellent gas sensing capabilities.
    CrystEngComm 03/2013; 15(15):2929-2933. · 3.88 Impact Factor
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    ABSTRACT: With the aid of the slow release of water from esterification reactions, a simple one-step solvothermal method was developed to prepare TiO2 hollow spheres with an opening hole. Organic carboxylic acids (CA) were exploited as not only the reactant to conduct esterification with ethanol, but also the coordination agent to modify titanium n-butoxide (TNB) to manipulate its hydroxylation and condensation process. The specific TiO2 morphologies prepared by this CA-assisted method significantly depend on the molecular structure and relative concentration of the carboxylic acids used. Appropriate carbon chain length of the CA molecule and the optimal molar ratio of CA/TNB are the essential factors to fabricate well-developed TiO2 hollow spheres with an opening hole. The surface hole facilitates active material transportation into the hollow interior, so this structure of TiO2 has been utilized in lithium-ion batteries and exhibits superiority in rate performance compared to closed spheres.
    New Journal of Chemistry 02/2013; 37(3):784-789. · 2.97 Impact Factor
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    ABSTRACT: A novel architecture of graphene paper is proposed to consist of "1D metallic nanowires/defect-free graphene sheets". Highly conductive and flexible papers of 1D silver nanowires (Ag NWs) and chemical vapor deposition (CVD) graphene sheets as an example were fabricated by a simple filtration method. CVD graphene paper possesses much higher electrical conductivity of 1097 S/cm, compared with other reported carbon-related papers (graphene, carbon nanotube, etc.). With the addition of Ag NWs to form Ag NWs/graphene paper, the electrical conductivity is further improved up to 3189 S/cm, even higher than ∼2000 S/cm of bulk graphite. Ag NWs/graphene papers have very good flexibility with the only <5% loss of electrical conductivity over 500 times mechanical bending. Highly conductive composite papers have potential in high-performance, flexible energy conversion and storage devices.
    ACS Applied Materials & Interfaces 02/2013; · 5.01 Impact Factor
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    ABSTRACT: We simulate a micromechanical exfoliation process to design a simple but effective and low-cost strategy for mass production of high-quality graphene sheets by planetary milling with oxalic acid. The selective carboxylation enables oxalic acid molecules to adhere to the edge and defects of graphite like a Scotch tape and plays a crucial role in the non-destructive exfoliation.
    J. Mater. Chem. A. 12/2012; 1(3):500-504.
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    ABSTRACT: An oriented millerite nickel sulfide (NiS) nanorod array was successfully grown on bare glass substrate. Metallic conductivity and outstanding electrocatalytic activity make it possible to function as a new type of “two-in-one” counter electrode (CE) in dye-sensitized solar cells (DSCs) to replace both the transparent conductive oxide (TCO) and Pt electrocatalyst. When applied in DSCs, an impressive power conversion efficiency of 7.41% was achieved, comparable to that of TCO supported Pt CE (7.55%). The NiS nanoarray film could be a potential candidate to realize a “two-in-one” CE in DSCs, which is highly desirable to reduce the fabrication cost of DSCs while retaining a comparable conversion efficiency.
    J. Mater. Chem. A. 12/2012; 1(2):194-198.
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    ABSTRACT: Low-temperature aluminum (Al) reduction is first introduced to reduce graphene oxide (GO) at 100-200 °C in a two-zone furnace. The melted Al metal exhibits an excellent deoxygen ability to produce well-crystallized reduced graphene oxide (RGO) papers with a low O/C ratio of 0.058 (Al-RGO), compared with 0.201 in the thermally reduced one (T-RGO). The Al-RGO papers possess outstanding mechanical flexibility and extremely high electrical conductivities (sheet resistance R(s) ∼ 1.75 Ω/sq), compared with 20.12 Ω/sq of T-RGO. More interestingly, very nice hydrophobic nature (90.5°) was observed, significantly superior to the reported chemically or thermally reduced papers. These enhanced properties are attributed to the low oxygen content in the RGO papers. During the aluminum reduction, highly active H atoms from H(2)O reacted with melted Al promise an efficient oxygen removal. This method was also applicable to reduce graphene oxide foams, which were used in the GO/SA (stearic acid) composite as a highly thermally conductive reservoir to hold the phase change material for thermal energy storage. The Al-reduced RGO/SnS(2) composites were further used in an anode material of lithium ion batteries possessing a higher specific capacity. Overall, low-temperature Al reduction is an effective method to prepare highly conductive RGO papers and related composites for flexible energy conversion and storage device applications.
    ACS Nano 09/2012; 6(10):9068-78. · 12.03 Impact Factor

Publication Stats

24 Citations
129.72 Total Impact Points

Institutions

  • 2011–2014
    • Chinese Academy of Sciences
      • State Key Laboratory of High Performance Ceramics and Superfine Microstructures
      Peping, Beijing, China
  • 2012–2013
    • Northeast Institute of Geography and Agroecology
      • State Key Laboratory of High Performance Ceramics and Superfine Microstructures
      Beijing, Beijing Shi, China