CRYSTENGCOMM
·
2012
·Vol. 14
·期 17
·5627-5633
·
IF 3.842
Xianlong Zhou,Tengfei Zhou,Juncheng Hu,Jinlin Li
Novel SnO2 nanoparticle-decorated SnS2 nanosheets were synthesized via a one-pot solvothermal process using SnCl4·5H2O and CH4N2S as precursors. SnS2@SnO2 nanosheets were characterized by XRD, TEM, FESEM, XPS and UV-vis diffuse reflectance spectra (DRS). The band-gap of SnO2@SnS2 can be easily tuned by the controlled experimental strategy. Anisole and ethanol with different volume ratios were used as binary solvent to tune the composition of SnS2@SnO2 nanocomposites (NCs) continuously and the composites gradually change from hexagonal SnS2 into tetragonal SnO2. All of the SnS2@SnO2 nanosheets exhibited enhanced visible light photocatalytic activity, which was remarkably superior to SnS2, SnO2 and Degussa P-25. The obtained SnS2@SnO2 NCs with Vethanol/Vanisole = 1 : 2 showed the best photocatalytic capability. Furthermore, the formation mechanism of SnS2@SnO2 nanosheets has also been discussed.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 15
·155705
·
IF 3.953
Xing Zhang,Hao Chen,Wei Zhang,Lina Zhang,Xinyu Liu,Jinwen Ma,Shichong Xu,Haibo Li
Exploring and fabricating a suitable photoanode with high catalytic activity is critical for enhancing photoelectrochemical (PEC) performance. Herein, a novel 3D hierarchical Fe2O3/SnO2 photoanode was fabricated by a hydrothermal route, combining with an annealing process. The morphology, crystal structure were studied by scanning electron microscopy, transmission electron microscopy, x-ray photon spectroscopy, and x-ray diffraction, respectively. The results reveal the successful preparation of Fe2O3 nanothorns on the surface of SnO2 nanosheets. The as-fabricated 3D Fe2O3/SnO2 photoanode yields obviously promoted PEC performance with a photocurrent density of approximate 5.85 mA cm−2, measured in a mixture of Na2S (0.25 M) and Na2SO3 (0.35 M) aqueous solution at 1.23 V (versus reversible hydrogen electrode, RHE). This value of photocurrent is about 53 times higher than that of the bare SnO2 photoanode. The obvious improved PEC properties can be attributed to the 3D Fe2O3/SnO2 heterostructures that offer outstanding light harvesting ability as well as improved charge transport and separation. These results suggest that exploring a suitable 3D hierarchical photoanode is an effective approach to boost PEC performance.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Kechuang Wan,Ding Wang,Feng Wang,Huijun Li,Jingcheng Xu,Xianying Wang,Junhe Yang
In this work, three-dimensional (3D) hierarchical In2O3@SnO2 core–shell nanofiber (In2O3@SnO2) was designed and successfully prepared via a facile electrospinning and further hydrothermal methods. Vertically aligned SnO2 nanosheets uniformly grown on the outside surface of In2O3 nanofibers were clearly observed by field emission scanning electron microscopy. Besides, hierarchical core–shell nanostructure of In2O3@SnO2 was characterized by elemental maps using scanning transmission electron microscopy. The formaldehyde (HCHO) sensing performances of pure In2O3 nanofibers, SnO2 nanosheets, and In2O3@SnO2 core–shell nanocomposite were compared, and the In2O3@SnO2 nanocomposite possessed highest response value, fast response/recovery speed, best selectivity, and lowest HCHO detection limit. Specifically, the response value (Ra/Rg) of the In2O3@SnO2 nanocomposite reached 180.1 toward 100 ppm of HCHO gas, which was near 9 and 6 times higher than that of the pure In2O3 nanofibers (Ra/Rg = 19.7) and pure SnO2 nanosheets (Ra/Rg = 33.2), respectively. In addition, the gas sensor showed instantaneous response/recovery time (3/3.6 s) toward 100 ppm of HCHO at the optimal operation temperature of 120 °C. More importantly, the detection limit toward HCHO gas was as low as 10 ppb (Ra/Rg = 1.9), which could be used for trace HCHO gas detection. The excellent sensing properties of the In2O3@SnO2 were attributed to the synergistic effect of large specific surface areas of SnO2 nanosheet arrays, abundant adsorbed oxygen species on the surface, unique electron transformation between core–shell heterogeneous materials, and long electronic transmission channel of SnO2 transition layer. This work provides an efficient route for the preparation of novel hierarchical sensitive materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2023
·
IF 4.6
Haiyang Zhang,Hongyan Zhang,Jianping Man,Chu Chen
A humidity sensor with high performance based on Fe 3+ ions doped with SnO 2 (Fe/SnO 2 ) was synthesized by hydrothermal method and its mechanism was studied by the first principle based on density functional theory . Experimental results show that doping Fe 3+ ions can effectively improve the performance of SnO 2 humidity sensor. Compared with SnO 2 , the resistance of Fe/SnO 2 humidity sensor increases from 4.5 to 5.5 orders of magnitude, the humidity hysteresis error decreases from 42.4% to 3.8% and the response/recovery time changes from 11 s/48 s–10 s/8 s. Calculations show that Fe 3+ ions can enhance the chemical and physical adsorption energy , improving the sensitivity and linearity and reducing the hysteresis error and recovery time of SnO 2 , respectively. Moreover, a simple circuit for respiratory detection was designed based on Fe/SnO 2 , and the number of LED lights can distinguish different breathing states through resistance changes of the Fe/SnO 2 humidity sensor. This study indicate Fe / SnO 2 humidity sensor can be used in non-contact and visual breath detection, which has potential applications in preventing respiratory disease.
研究领域:
材料科学
·
传感器技术
·
医学应用
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2024
·
IF 3.7
Lihan Deng,Pengfei Chen,Jin Li
BiOBr nanosheets were loaded onto SnO 2 quantum dots, ZnO nanosheets, and SnO 2 /ZnO-2 (SZ-2) to form different heterojunction photocatalysts by sonochemistry, respectively. The photocatalytic activity of the prepared photocatalysts was evaluated by degrading the target dye Rhodamine B (RhB). The results showed that the degradation efficiency of BiOBr/SnO 2 /ZnO (BSZ) for RhB reached 97.5% at 80 min. The significant increase in catalytic activity of BSZ was attributed to the synergistic and interfacial effects among the three materials. Combined with the radical trapping experiments, it can be concluded that the catalytic mechanism of BSZ as a dual Z-type heterojunction.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Haiyang Zhang,Hongyan Zhang,Chu Chen,Ling Zhang,Xiujuan Ma,Xudong Li,Jun Wang
In this paper, silver nanoparticles (AgNPs) modified SnO 2 (Ag/SnO 2 ) nanocomposite with excellent humidity performance was prepared by hydrothermal method. Experimental results demonstrate that AgNPs enhance the performance of the SnO 2 humidity sensor, which is primarily attributed to increase the oxygen vacancies on the surface of the SnO 2 through the incorporation of AgNPs. Density functional theory (DFT) demonstrated that more oxygen vacancies can enhance the chemical and physical adsorption energy of water molecules by SnO 2 , and decompose more water molecules into conductive H + ions: simultaneously, the response/recovery times and hysteresis error of SnO 2 are reduced. Compared to the SnO 2 humidity sensor, Ag/SnO 2 exhibits low humidity hysteresis (2.7%), relatively short response/recovery time (5/8 s) and high sensitivity (24292.3). Furthermore, the Ag/SnO 2 humidity sensor employed in this study has successfully demonstrated its efficacy in detecting humidity levels within tobacco storage environments, which expands the potential applications of humidity sensors.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Xueling Yuan,Lixia Sun,Junqi Wang,Dankui Liao,Jianhua Sun
Pyrolyze metal-organic frameworks (MOFs) is a promising method to prepare metal oxides with large specific surface and multiple active sites. The obtained metal oxides can be utilized as gas sensors. Noble metal doping is an effective way to improve the gas sensitivity of materials. In this work, SnO 2 are prepared by pyrolyzation of metal organic frameworks and Ag-doped SnO 2 composites are fabricated by AgNO 3 reduction in a water bath at 4 °C. The gas-sensing experiment reveals that the optimum operating temperature of different mass fraction of Ag doped SnO 2 samples is 250 °C which is lower than pure SnO 2 (300 °C). The response of composites (7 wt% Ag–SnO 2 ) is 157 to 10 ppm ethanol, which is about 10 times higher than pure SnO 2 (14). The composites have good selectivity and stability. Such excellent performance is contributed to the increase of the gas adsorption capacity , catalytic active site and oxygen vacancy of the composites caused by the doping of Ag.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Yang Li,Huitao Ban,Mujie Yang
Nanocomposites of SnO 2 nanosheets and polypyrrole (PPy) were facilely prepared and their gas sensing properties towards low concentration of NH 3 have been investigated at room temperature. Vertically aligned SnO 2 nanosheets were in situ grown on the substrates via hydrothermal treatment of electrospun nanofibers containing SnCl 2 precursors at a low temperature (135 °C), and coated with PPy by vapor phase polymerization of pyrrole. The SnO 2 nanosheets and the nanocomposites were characterized by X-ray diffraction patterns, Fourier transform infrared spectroscopy, field emission scanning electron microscopy and high resolution transmission microscopy. The nanocomposite sensors exhibited much higher response magnitude towards NH 3 than the sensors based on PPy alone. The effect of the type of doping acids and polymerization time of pyrrole on the sensing properties of the nanocomposites was examined. The nanocomposite sensors revealed sensitive (sensitivity of ∼6.2%/ppm in the range of 1–10.7 ppm of NH 3 , detection limit of ∼257 ppb), selective and repeatable response to NH 3 , and the sensing mechanism has been explored. This work could provide references for the facile preparation of advanced gas sensors based on in situ grown nanostructured metal-oxide semiconductors and their composites.
研究领域:
材料科学
·
化学工程
·
传感器技术
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Ji Li,Ming Yang,Xiaoli Cheng,Xianfa Zhang,Chuanyu Guo,Yingming Xu,Shan Gao,Zoltán Major,Hui Zhao,Lihua Huo
In order to challenge high working temperature, low response and low selectivity of present NO 2 sensor, porous SnO 2 nanotoasts with a large surface area (79.94 m 2 /g) were synthesized. Thick film sensors fabricated by the SnO 2 nanotoasts exhibited a high response to NO 2 gas operating at room temperature. Excellent performance for NO 2 sensing gas at 50 °C, included the high response of 105.2 (10 ppm), low detection limitation of 0.1 ppm, fast response within 10 s, and wide range of 0.1–10 ppm (R 2 = 0.9931). These sensors also demonstrated perfect selectivity, moisture resistance and 90 days of long-term stability. SnO 2 nanotoasts sensor has excellent detection ability in actual detection. The superior response of porous SnO 2 nanotoasts towards NO 2 was attributed to the special porous structure with large specific surface area and oxygen vacancies in sensing material, which helped adsorption of the target gas molecules onto the sensing surfaces and transfer of the charge.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 9
·1250
·
IF 4.034
Hongcheng Liu,Feipeng Wang,Kelin Hu,Bin Zhang,Li He,Qu Zhou
In this paper, the porous NiO/SnO2nanofibers were synthesized via the electrospinning method along with the carbonization process. The characterization results show that the pristine SnO2-based nanofibers can form porous structure with different grain size by carbonization. The hydrogen gas-sensing investigations indicate that the NiO/SnO2sensor exhibits more prominent sensing properties than those of pure SnO2sensor devices. Such enhanced performance is mainly attributed to the porous nanostructure, which can provide large active adsorption sites for surface reaction. Moreover, the existence of p-n heterojunctions between NiO and SnO2also plays a key role in enhancing gas-sensing performances. Finally, the H2sensing mechanism based on the NiO/SnO2nanocomposite was proposed for developing high-performance gas sensor devices.Keywords:NiO/SnO2nanofibers;p-n heterojunctions;porous nanostructure;H2sensor
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 16
·13371-13376
·
IF 3.289
Yunshi Liu,Ping Yang,Jia Li,Katarzyna Matras-Postolek,Yunlong Yue,Baibiao Huang
SiO2@SnO2 core–shell nanofibers (NFs) were successfully prepared by single-spinneret electrospinning and subsequent calcination process. The precursor solutions were prepared from poly(vinylpyrrolidone), SnO2 precursors, and tetraethylorthosilicate (TEOS) with prehydrolysis. The prehydrolysis of TEOS plays an important role for the formation of core–shell structure. After calcining, the resulting fiber sample had an amorphous SiO2 core and a shell consisted of SnO2 particles. The fibers with various morphologies were obtained through adjusting the molar ratio of Sn and Si and the possible formation mechanism of core–shell NFs was proposed. Both Kirkendall effect and grain growth played important roles for the formation of core–shell structure. Furthermore, SiO2 was used as support material to fix the SnO2 particles and avoid the collapse of the SnO2 structure. The amount of SnO2 precursors directly determined the compactness of the shell, resulting in the different gas sensing properties. The SiO2@SnO2 core–shell NF network sensor responds to ethanol, ammonia, benzene, toluene, chloroform, and hexane gases, but it exhibited enhanced gas response to ethanol with a short response time. Those SnO2 particles formed on the exterior of the fibers provided lots of contact area with the target gas to reduce resistance. In addition, the connectivity between particles also had certain influence on the electrical conductivity of the sample. The results demonstrate that single-spinneret electrospinning can also be used to prepare core–shell fibers with various applications.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Fei Gao,Zhe Yi Li,Zhao Qi Li,Qiao Nan Wang,Bi Cheng Li,Lei Wang,Meng Zhao,Jing Chang Nan,Cong Wang
This paper presents a novel high sensitivity microwave sensor for low-concentration acetone gas detection. The electrically coupled resonator loaded with an interdigital capacitor (ECR-IDC) structure is the sensing area, with a maximum electric field strength of 3.71 × 10
5
V/m. The SnO
2
-MXene nanocomposites with different MXene doping ratios were prepared using an ultrasound-assisted dispersion method, which significantly changed the conductivity of the gas-sensitive material. Experimental results revealed that the developed sensor exhibited a high sensitivity of 51.7 mdB/ppm and excellent linearity in the detection range of 1-20 ppm, attributed the heterojunction like structure of the SnO
2
-MXene nanocomposites. The introduction of MXene induced a decrease in conductivity, which is beneficial for microwave sensing, and simultaneously increased the active sites of the composite for acetone binding, finally improving the sensitivity of the microwave sensors. The demonstrated high performance of the developed sensor validates its potential in breath analysis, towards future applications in designing novel healthcare devices.
研究领域:
材料科学
·
传感器技术
·
医疗健康设备
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）