Lichun Zhang

Sichuan University, Hua-yang, Sichuan, China

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Publications (33)120.27 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: A facile, green and one-step synthesis strategy towards highly fluorescent g-CNQDs via solid-phase pyrolyzing melamine and EDTA at low temperature was proposed. The obtained g-CNQDs can produce strong chemiluminescence (CL) in the presence of K3[Fe(CN)6]. The mechanism of the g-CNQDs–K3[Fe(CN)6] CL system was investigated by using CL, UV-Vis absorption, IR, fluorescence and electron spin resonance (ESR) spectrum. The CL emission was probably from the radiative recombination of oxidant-injected holes and the thermally excited electrons in g-CNQDs. The established new CL system was successfully applied to determinate dopamine in the range of 1 × 10−8 to 2 × 10−6 M with a detection limit of 4.7 nM (S/N = 3). The protocol was validated by analyzing serum samples with excellent sensitivity and good recoveries. The new CL system offered a valuable insight for the properties of luminescent g-CNQDs in CL field, and opened a new avenue for its practical applications.
    RSC Advances 06/2015; 5(68). DOI:10.1039/C5RA05397H · 3.71 Impact Factor
  • Lichun Zhang, Hongjie Song, Yingying Su, Yi Lv
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    ABSTRACT: Cataluminescence (CTL) emitted on the surface of solid materials during a catalytic reaction is a very interesting phenomenon, which gives a novel, powerful tool for chemical analysis. Nanomaterial-assisted CTL is a promising transduction principle for gas sensing, and its main features of high sensitivity and long lifetime are also favorable for developing a wide array of analytical devices. This review summarizes advances in nanomaterial-assisted CTL methodologies, including the working mechanism, exploration of sensing materials, innovations in strategy and instrumentation, new types of CTL-based sensing system, and their application to analysis of complex gases and volatile organic compounds. Finally, we discuss some critical challenges and prospects in this field.
    TrAC Trends in Analytical Chemistry 02/2015; 67. DOI:10.1016/j.trac.2015.01.008 · 6.61 Impact Factor
  • Yueyang Weng, Lichun Zhang, Wei Zhu, Yi Lv
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    ABSTRACT: Self-assembly of one-dimensional nanoscale building blocks into functional 2-D or 3-D complex superstructures is of great importance. In this work, we have developed a facile hydrothermal method to synthesize coral-like Zn-doped SnO2 hierarchical structures assembled from nanorods. XRD, SEM, TEM, XPS, FTIR and N2 adsorption–desorption were used to characterize the compositions and microstructures of the samples obtained. The growth mechanism was also explored by investigating the samples synthesized at different reaction time. As sensing materials for cataluminescence (CTL) gas sensor, this coral-like Zn-doped SnO2 demonstrates excellent CTL behaviour (that is, high sensitive, superior selective to 2-butanone compared with other fifteen kinds of common volatile organic compounds (VOCs) as well as fast response and recovery). Three different Zn/Sn molar ratio of SnO2 samples were tested under the same condition to prove the effect of Zn doping concentration on the sensing performance. We further studied the analytical characteristics of the CTL sensor based on 1:10 Zn-doped SnO2 sensing material for 2-butanone under the optimal experimental conditions. The linear range of the gas sensor was 2.31–92.57 µg mL-1 (R= 0.9983), and the detection limit was 0.6 µg mL-1 (S/N=3).
    02/2015; 3(13). DOI:10.1039/C5TA00495K
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    ABSTRACT: α-Fe2O3/g-C3N4 composites catalysts were prepared through a facile method of refluxing. Thermogravimetric analysis (TG), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM) were employed to characterize the as prepared α-Fe2O3/g-C3N4, which displayed distinguished cataluminescence (CTL) properties in the process of detecting H2S gas. When the α-Fe2O3 content in the composite reaches 5.97%, the most outstanding CTL responses are observed. Under the optimized conditions, the linear detection range of the H2S gas sensor was 0.88-7.01 μg mL−1 (r = 0.998) with the detection limit of 0.5 μg mL−1 (S/N = 3). Furthermore, the H2S gas sensor showed superior selectivity to H2S gas compared with other fourteen kinds of common volatile organic compounds (VOCs), as well as fast response (0.1 s) and recovery (0.6 s). These properties render α-Fe2O3/g-C3N4 composite promising candidate for applications in various fields.
    Sensors and Actuators B Chemical 02/2015; 211. DOI:10.1016/j.snb.2015.01.094 · 3.84 Impact Factor
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    ABSTRACT: In the present work, we developed a miniaturized tungsten coil device, a cataluminescence gas detector for alcohols and ketones using zinc oxide-doped tin dioxide (SnO2:ZnO) nanowires as the sensing materials. SnO2:ZnO nanowires were controllably deposited on tungsten coil which was coated with Au/reduced graphene oxide composites via an atmospheric pressure chemical vapor deposition process. This SnO2:ZnO nanowires-based gas sensor has fast and sensitive response to alcohols and ketones with a wide range. The response time and recovery time of the present sensor for ethanol were 7s and 40s, respectively. The linear range of ethanol was 11.7-204.7 mu gmL(-1) with a detection limit of 11.0 mu gmL(-1) (S/N = 3). In addition, it has relatively good reproducibility, and its linear response to alcohols and ketones makes it to be promising in practical application.
    Sensors and Actuators B Chemical 11/2014; 203:726-735. DOI:10.1016/j.snb.2014.06.015 · 3.84 Impact Factor
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    ABSTRACT: In the present work, Y-doped metal-organic framework-5 (MOF-5) was synthesized by a simple solvothermal method and characterized by X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscopy and nitrogen adsorption-desorption measurements, and firstly used as gas sensor materials based on cataluminescence (CTL). When isobutanol passed through the surface of the material, CTL emission was observed. The luminescence characteristics and optimal parameters were investigated in detail. Under the optimized conditions, the present gas sensor exhibited a linear range of 6.4-80.1 mg L-1 toward isobutanol and with a limit of detection of 3.7 mg L-1. The designed CTL sensor based on Y-doped MOF-5 shows no or weak sensing performance for foreign common volatile organic compounds. Moreover, compared with pure MOF-5, Y-doped MOF-5 exhibited a better CTL response to isobutanol under the same conditions. This work exploits a new application domain of metal-organic frameworks (MOFs).
    Sensors and Actuators B Chemical 10/2014; 201:413-419. DOI:10.1016/j.snb.2014.05.051 · 3.84 Impact Factor
  • Shuguang Yan, Lichun Zhang, Yurong Tang, Yi Lv
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    ABSTRACT: Ag2Se quantum dots (QDs) have attracted a lot of interest due to their potential applications in biosensing and bioimaging. A strategy is presented that involves coupling of selenium powder reduction with the binding of silver ions, and thioglycollic acid (TGA) and glycine as stabilizers to obtain ultrasmall Ag2Se QDs at 85 °C in aqueous solution. This strategy avoids high temperatures, high pressures and organic solvents so that water-soluble 3 nm Ag2Se QDs can be directly obtained. The conjugation of ConA to TGA stabilized Ag2Se QDs by hydrogen bonds leads to the adsorption of ConA to Ag2Se QDs and forms the aggregation and leads to the generation of resonance Rayleigh scattering (RRS) as a readout signal for the sensing events. The reaction mechanism of Ag2Se QD RRS enhancement is studied in this work. The resulting RRS sensor enables the detection of ConA with limit of detection reaching 0.08 μg mL(-1) concentration in a wide linear range from 0.27 μg mL(-1) to 35 μg mL(-1). The recovery of spiked ConA in human serum samples ranges from 94% to 106%. The relative standard deviation (RSD) for eleven replicate detections is 3.6%. Our results correlate many important experimental observations and will fuel the further growth of this field.
    The Analyst 06/2014; 139(17). DOI:10.1039/c4an00579a · 3.91 Impact Factor
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    ABSTRACT: A facile one-step microwave-assisted approach for the preparation of strong fluorescent carbon nitride quantum dots (g-CNQDs) by using guanidine hydrochloride and EDTA as the precursors was developed. Strong chemiluminescence (CL) emission was observed when NaClO was injected into the prepared g-CNQDs and a novel CL system for in direct detection of free chlorine was established. Free residual chlorine in water was sensitively detected with a detection limit of 0.01 μM and had a very wide detection range of 0.02 μM to 10 μM. Based on CL spectral, UV-visible absorption spectral, and electron spin resonance (ESR) spectral studies, as well as investigations on the effects of various free radical scavengers, a possible CL mechanism was proposed. It was suggested that the radiative recombination of oxidant-injected holes and electrons in the g-CNQDs accounted for the CL emission. Meanwhile, 1O2 on the surface of g-CNQDs, generated from some reactive oxygen species in the g-CNQDs-NaClO system, could transfer energy to g-CNQDs and thus further enhanced the CL emission. The CL system is highly sensitive and differentiable, opening a new field for the development of novel CL emitting species, but also expanding the conventional optical utilizations of g-CNQDs.
    Analytical Chemistry 03/2014; 86(9). DOI:10.1021/ac5005162 · 5.83 Impact Factor
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    ABSTRACT: A facile catalyst-free atmospheric pressure chemical vapour deposition (APCVD) method for the growth of hierarchical SnO2 architectures on graphene is demonstrated. SnO2 2D nanorod arrays, flower@column composites, dendrite structures, and nanoparticles grown on graphene, named as SnO2/graphene architectures, were synthesized on Thermally-Reduced Graphene Oxide (TRGO) and Chemically-Reduced Graphene Oxide (CRGO), respectively. According to characterizations, the rutile SnO2 architectures had large-area uniformity and high crystallinity, which were highly densely and uniformly grown on graphene. A self-catalyzed vapor-solid (VS) and a self-catalyzed vapor-liquid-solid (VLS) mechanisms were proposed based on the detailed observation on the growth behaviour of the SnO2/graphene materials. The synthesized SnO2/graphene materials were directly used to construct gas sensors for methanol detection based on the cataluminescence (CTL) emission. Further study indicated that the SnO2/graphene materials showed enhanced CTL response to methanol and a morphology-dependent CTL performance. And then a fast and highly effective gas sensor for selective detection of methanol was designed based on the SnO2/graphene nanoparticles. The linear range of the methanol gas sensor was 6.3-88.5 μg mL−1, and the detection limit was 5.2 μg mL−1 (S/N = 3).
    CrystEngComm 01/2014; 16(16):3331. DOI:10.1039/c3ce42538j · 3.86 Impact Factor
  • Xue Jiao, Lichun Zhang, Yi Lv, Yingying Su
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    ABSTRACT: A novel and highly sensitive gas sensor for alcohols (methanol, ethanol, propanol, isopropanol, butanol, and isobutanol) was proposed based on cataluminescence (CTL) on the surface of nano-CdS. Using cetrimonium bromide (CTAB) as template, the nano-sized sensing material CdS was successfully obtained by a simple hydrothermal synthesis process. The luminescence characteristics and the experiment conditions were investigated in detail. Under the optimized conditions, little interference was observed while eleven foreign substances were passing through the sensor. It demonstrated that this gas sensor has high selectivity for alcohols. The calibration curve (y = kx + b) of the relative CTL intensity versus the concentration of methanol was made, with the linear range of 1.2-76.1 mu g mL(-1) and the detection limit of 0.5 mu g mL(-1) (S/N = 3). The relative standard deviation (R.S.D.) (n=7) of relative cataluminescence intensity for 58.5 mu g mL(-1) methanol was 4.3%. There was no significant change of the catalytic activity of the sensor for a week, with R.S.D. less than 5% by collecting the CTL intensity every hour. The method can be applied to detect alcohols in the air. The possible mechanism of CTL on the surface of nano-CdS was discussed preliminarily.
    Sensors and Actuators B Chemical 09/2013; 186:750-754. DOI:10.1016/j.snb.2013.06.077 · 3.84 Impact Factor
  • Yu Zhang, Yurong Tang, Xing Liu, Lichun Zhang, Yi Lv
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    ABSTRACT: At present, glutathione (GSH) is a very important biomarker in vivo. However, the sensitive and selective assay for the detection of GSH in biological matrix still keeps challenging due to the high complexity of samples. Lanthanide-doped upconverting phosphors (UCPs) which exhibit unique near-infrared (NIR) excitation nature are able to overcome interferences from complex samples. In this study, a novel probe based on the linkage of UCPs and dopamine-quinone through hydrogen bonding and electrostatic interaction has been designed for rapid, economic, sensitive and selective detection of GSH in aqueous solution and human blood serum. Here, dopamine-quinone served as an efficient quencher for upconverting fluorescence, while GSH as a strong reducing agent chemically reduced the dopamine-quinone turning on the fluorescence. The fluorescence recovery was found to be proportional to GSH concentration within the range from 1 to 75 μM. The detection limit of this sensor was 0.29 μM, which was quite competitive for GSH detection. The simple, sensitive and selective fluorescence method took full advantages of UCPs properties of low interferences and broadened the application scope of UCPs in complex biological detection.
    Sensors and Actuators B Chemical 08/2013; 185:363–369. DOI:10.1016/j.snb.2013.05.015 · 3.84 Impact Factor
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    ABSTRACT: We report a facile one-pot sonochemical approach to preparing highly water-soluble Ag nanoclusters (NCs) using bovine serum albumin as a stabilizing agent and reducing agent in aqueous solution. Intensive electrogenerated chemiluminescence (ECL) was observed from the as-prepared Ag (NCs) and successfully applied for the ECL detection of dopamine with high sensitivity and a wide detection range. A possible ECL mechanism is proposed for the preparation of Ag NCs. With this method, the dopamine concentration was determined in the range of 8.3 × 10(-9) to 8.3 × 10(-7) mol/L without the obvious interference of uric acid, ascorbic acid and some other neurotransmitters, such as serotonin, epinephrine and norepinephrine, and the detection limit was 9.2 × 10(-10) mol/L at a signal/noise ratio of 3. Copyright © 2013 John Wiley & Sons, Ltd.
    Luminescence 07/2013; 28(4). DOI:10.1002/bio.2489 · 1.68 Impact Factor
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    ABSTRACT: In this paper, a novel and simple colorimetric method for the determination of glutathione (GSH) was developed. The BSA–MnO2 NPs possess oxidase-like activity that can catalyze the oxidization of 3,3′,5,5′-tetramethylbenzidine (TMB), and the existence of GSH can cause reduction of oxidized TMB along with a visual color variation. A good linear relationship can be obtained from 0.26 to 26 μM with a limit of detection of 0.1 μM. Furthermore, the good recoveries for serum samples indicated that the present colorimetric methodology was feasible, simple and sensitive, with a promising application in routine analysis of biosamples.
    New Journal of Chemistry 06/2013; 37(7):2174-2178. DOI:10.1039/C3NJ40897C · 3.16 Impact Factor
  • Dongli Deng, Hao Deng, Lichun Zhang, Yingying Su
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    ABSTRACT: A simple and rapid capillary electrophoresis method was developed for the separation and determination of ephedrine (E) and pseudoephedrine (PE) in a buffer solution containing 80 mM of NaH2PO4 (pH 3.0), 15 mM of β-cyclodextrin and 0.3% of hydroxypropyl methylcellulose. The field-amplified sample injection (FASI) technique was applied to the online concentration of the alkaloids. With FASI in the presence of a low conductivity solvent plug (water), an approximately 1,000-fold improvement in sensitivity was achieved without any loss of separation efficiency when compared to conventional sample injection. Under these optimized conditions, a baseline separation of the two analytes was achieved within 16 min and the detection limits for E and PE were 0.7 and 0.6 µg/L, respectively. Without expensive instruments or labeling of the compounds, the limits of detection for E and PE obtained by the proposed method are comparable with (or even lower than) those obtained by capillary electrophoresis laser-induced fluorescence, liquid chromatography-tandem mass spectrometry and gas chromatography-mass spectrometry. The method was validated in terms of precision, linearity and accuracy, and successfully applied for the determination of the two alkaloids in Ephedra herbs.
    Journal of chromatographic science 04/2013; DOI:10.1093/chromsci/bmt039 · 1.03 Impact Factor
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    ABSTRACT: Water-soluble and luminescent ZnO quantum dots (QDs) capped by (3-aminopropyl) triethoxysilane (APTES) are environment-friendly with strong photoluminescence (max. wavelength: 530nm). Interestingly, it was found that the fluorescence could be quenched by dopamine (DA) directly. On the basis of above, a novel ZnO QDs based fluorescent probe has been successfully designed to detect DA with high selectivity and sensitivity. Moreover, the possible fluorescence quenching mechanism was proposed, which showed that the quenching effect may be caused by the electron transfer from ZnO QDs to oxidized dopamine-quinone. Under optimum conditions, the relative fluorescence intensity was linearly proportional to the concentration of DA within the range from 0.05 to 10μM, with the detection limit down to 12nM (n=3). Also, the selectivity experiment indicated the probe had a high selectivity for DA over a number of possible interfering species. Finally, this method was successfully used to detect DA in serum samples with quantitative recoveries (99-110%). With excellent selectivity and high sensitivity, it is believed that the ZnO QDs based fluorescent probe has a potential for the practical application in clinical analysis.
    Talanta 03/2013; 107C:133-139. DOI:10.1016/j.talanta.2013.01.006 · 3.51 Impact Factor
  • Qi Wang, Xing Liu, Lichun Zhang, Yi Lv
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    ABSTRACT: Carbon nanodots (C-Dots) as a new form of carbonaceous nanomaterials have aroused much interest and intensive research due to their inspiring properties. Compared to traditional semiconductor quantum dots, these newly emergent nanodots possess a number of advantageous characteristics, among which low-toxicity is particularly fascinating. More and more research into C-Dots have focused on synthesis methods and biology-related applications. Microwave-assisted approaches have attracted attention because microwave treatment can provide intensive and efficient energy, and as a consequence shorten the reaction time. In this article, we designed a "green", rapid, eco-friendly and waste-reused approach to synthesize fluorescent and water-soluble C-Dots from eggshell membrane (ESM) ashes according to a microwave-assisted process. ESM selected as the carbon source was a common protein-rich waste in daily life and can be obtained easily and cheaply. The C-Dots from our method showed the maximal fluorescence emission peak at 450 nm and the fluorescence quantum yield was about 14%. We further designed a sensitive probe for glutathione based on the fluorescence turn off and on of the C-Dots-Cu(2+) system, which showed a linear range of 0.5-80 μmol L(-1) and detection limit of 0.48 μmol L(-1). In general, the C-Dots prepared briefly and inexpensively from ESM revealed excellent fluorescent property with promising potential for applications such as sample detection and biotechnology.
    The Analyst 10/2012; 137(22):5392-7. DOI:10.1039/c2an36059d · 3.91 Impact Factor
  • Pingyang Cai, Hongjie Song, Lichun Zhang, Yi Lv
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    ABSTRACT: In the present work, ZnO hierarchical microspheres were synthesized by hydrothermal methods in the sodium dodecyl sulfate-N,N-dimethyl-formamide-thiourea (SDS-DMF-thiourea) system. XRD, SEM, TEM, and N2 adsorption measurements were used to characterize the prepared ZnO materials. Compared with ZnO nanoparticles (ZnO NPs), the as-prepared ZnO hierarchical microspheres (ZnO HMs) exhibit a better cataluminescence (CTL) response to ethanol. The response and recovery time of the home-made ethanol gas sensor with zinc oxide hierarchical microspheres as sensing materials were about 5 s and 25 s, respectively. The linear dependence of the sensitivity on the ethanol concentration was observed in the range of 4–400 ppm with excellent selectivity. These results indicated that ZnO hierarchical microspheres would be a good candidate for fabricating practical cataluminescence ethanol sensor.
    Sensors and Actuators B Chemical 10/2012; 173:93–99. DOI:10.1016/j.snb.2012.06.020 · 3.84 Impact Factor
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    ABSTRACT: The enzymatic spectrophotometric analysis of uric acid based on BSA-stabilized Au nanoclusters (Au NCs) as peroxidase mimetics was first developed. Compared with natural enzyme horseradish peroxidase (HRP), which was used widely to detect H2O2 generated by uric acid, the BSA-stabilized Au NCs as peroxidase mimetics are easy to prepare, low cost, and stable. Kinetic analysis indicates that the BSA-stabilized Au NCs have even higher catalytic activity than HRP. Under the optimum conditions, the detection limit for uric acid is 3.6 x 10(-7) mol L-1. The feasibility of the developed method for uric acid analysis in human serum was confirmed.
    Spectroscopy Letters 10/2012; 45(7):511-519. DOI:10.1080/00387010.2011.649440 · 0.72 Impact Factor
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    ABSTRACT: Well-redispersed ceria nanoparticles (CeO2 NPs) were synthesized by a simple hydrothermal method. The prepared CeO2 NPs exhibited excellent catalytic activity towards classical peroxidase substrate 3,3,5,5-tetramethylbiphenyl dihydrochloride (TMB·2HCl) in the presence of H2O2, based on which a colorimetric method that is highly sensitive and selective was developed for glucose detection. The composition, structure, morphology and peroxidase-like catalytic activity of CeO2 NPs are investigated in detail by using X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectrometer (FT-IR), thermal analysis (TG) and UV-vis absorption spectroscopy. According to this method, the detection of H2O2 and glucose are in linear range from 6.0 × 10−7 to 1.5 × 10−6 mol L−1 and 6.6 × 10−6 to 1.3 × 10−4 mol L−1, with the detection limit down to 5.0 × 10−7 mol L−1 H2O2 and 3.0 × 10−6 mol L−1 glucose, respectively. Further, this simple, cheap, highly sensitive and selective colorimetric method for glucose detection was successfully applied for the determination of glucose in human serum samples.
    Analytical methods 09/2012; 4(10):3261-3267. DOI:10.1039/C2AY25511A · 1.94 Impact Factor
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    ABSTRACT: In the present work, In2O3 hierarchical hollow microsphere and flower-like microstructure were achieved controllably by a hydrothermal process in the sodium dodecyl sulfate (SDS)-N,N-dimethyl-formamide (DMF) system. XRD, SEM, HRTEM and N2 adsorption measurements were used to characterize the as-prepared indium oxide materials and the possible mechanism for the microstructures formation was briefly discussed. The cataluminescence gas sensor based on the as-prepared In2O3 was utilized to detect H2S concentrations in flowing air. Comparative gas sensing results revealed that the sensor based on hierarchical hollow microsphere exhibited much higher sensing sensitivity in detecting H2S gas than the sensor based on flower-like microstructure. The present gas sensor had a fast response time of 5 s and a recovery time of less than 25 s, furthermore, the cataluminescence intensity vs. H2S concentration was linear in range of 2–20 μg mL−1 with a detection limit of 0.5 μg mL−1. The present highly sensitive, fast-responding, and low-cost In2O3-based gas sensor for H2S would have many practical applications.
    Materials Research Bulletin 09/2012; 47(9):2212–2218. DOI:10.1016/j.materresbull.2012.06.002 · 2.29 Impact Factor