SENSORS AND ACTUATORS B-CHEMICAL
·
2025
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IF 7.7
Ping Li,Ying Yang,Feng Li,Wenyuan Pei,Dan Li,Hui Yu,Xiangting Dong,Tianqi Wang
With the significant increase in global awareness of environmental protection, green non-toxic gas sensors have become an important tool to promote sustainable development. In this work, a gas sensor based on Bi 2 S 3 green non-toxic semiconductor material was successfully prepared. By introducing polyoxometalate (POMs) electron acceptor into Bi 2 S 3 sensing material, its detection ability for NO 2 gas was significantly improved. At room temperature (25 °C), the Bi 2 S 3 /1 %PW 12 sensor has a response value of 41.88 to 100 ppm NO 2 , which is 4.36 times the response value of the Bi 2 S 3 sensor (9.61), highlighting its excellent detection performance. In addition, we thoroughly evaluated the selectivity , repeatability and other key gas sensing parameters of the sensor, further confirming its high-potential in practical applications. Through analysis of the mechanism underlying the performance enhancement, it is found that the appropriate addition of PW 12 as an electron acceptor can effectively inhibit the electron-hole recombination, thus significantly improving the performance of the sensor. This important discovery opens up a new way and method for the performance optimization of gas sensors, and is expected to inject new vitality into the future development of gas sensor technology.
研究领域:
材料科学
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环境监测
·
半导体物理
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纳米科技
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传感器技术
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 101
·期 3
·1591-1601
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IF 2.5
Renjie Deng,Yao Tian,Huajie Liu,Weiwei Yan
This work presents a novel heterogeneous catalytic system for the preparation of para -nitrotoluene ( p -NT) with nitrogen dioxide (NO 2 ) as a nitrating agent in the presence of oxygen (O 2 ). By applying dealuminated Hβ zeolite treated with oxalic acid (Hβ-Ox) as a catalyst, p -NT can be obtained with high conversion (90.5%) and selectivity (72.6%). In addition, it can be recycled at least five times without a significant decrease in catalytic activity. This result demonstrates that the catalyst has high efficiency, good stability, and regenerability. Meanwhile, the characteristics of pristine Hβ and different dealuminated Hβ zeolites modified with organic and inorganic acids were systematic contrastive studied using X-ray diffraction (XRD), nitrogen (N 2 ) adsorption-desorption, Fourier-transform infrared (FT-IR), scanning electron microscope (SEM), temperature-programed desorption of ammonia (NH 3 -TPD), pyridine adsorption infrared (Py-FT-IR), and solid state 27 Al nuclear magnetic resonance ( 27 Al MAS-NMR). Finally, the higher conversion and para -selectivity over Hβ-Ox also give a reasonable explanation in this paper.
研究领域:
化学工程
·
催化材料科学
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CHEMICAL ENGINEERING JOURNAL
·
2016
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IF 5.31
Binbin Shao,Yufan Chen,Deli Wu,Chaomeng Dai,Yalei Zhang
Structural Fe(II/III) hydroxides on the shell of nano-zerovalent iron (nZVI) are reactive sites for As(III) adsorption. Well-controlled structural Fe(II) hydroxides (SFH) is prepared to serve for As(III) removal in present study. With oxygen As(III) removal by SFH occurred efficiently but the removal efficiency was greatly reduced under anoxic conditions. The mineral transformation from SFH to lepidocrocite probably contributed to the robust removal efficiency of As(III). It is found that Cu(II), Cr(VI) and NO 2 − in aqueous solution could act as oxidants and promote the mineral transformation of SFH. A more efficient As(III) removal was therefore observed without oxygen. The removal efficiency decreased in the order O 2 /SFH ≈ Cu(II)/SFH > Cr(VI)/SFH ≈ NO 2 − /SFH at near neutral pH. The removal efficiency was less dependent on the initial pH for O 2 /SFH and Cu(II)/SFH systems than Cr(VI)/SFH and NO 2 − /SFH systems. Distribution of As on solid phases was able to describe the removal mechanism of As(III), and the results showed that the mineral transformation promoted the precipitation process and inhibited outer-sphere complexation, thus leading to enhanced As removal. With Cu(II), Cr(VI) and NO 2 − , the generation of oxidants from SFH transformation drove As(III) oxidation, and contributed to total As removal.
研究领域:
环境科学
·
化学
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yinfen Cheng,Junfeng Du,Nianzhong Ma,Zhong Li,Xinyi Hu,Lieqi Liu,Zhentao Ji,Jian Zhen Ou
The hazards to the ecological environment and human health promote the development of NO 2 monitoring sensors. However, the high operating temperature of traditional metal oxide sensitive materials limits the application of gas sensor-based systems in low power monitoring. Here, we utilize oxygen vacancy enriched 2D MoO 3-x , enabling the high performance optoelectronic NO 2 gas sensing at room temperature. The introduction of oxygen vacancies in MoO 3-x results in the red-shift light absorption from purple light to cyan light and high surface activity with negative potential, thus promoting its application in optoelectronic room temperature gas sensing. Under 365 nm UV light irradiation, oxygen vacancy enriched 2D MoO 3-x based gas sensor shows a good room temperature reversible response towards different concentrations of NO 2 , in which a response factor of 6.46 is achieved towards 10 ppm NO 2 . Moreover, excellent repeatability in six continuous tests, selectivity towards five common gases, and long-term stability for four months were also demonstrated in this sensor. This work provides an effective approach for tuning the electronic structure and surface activity of metal oxide, and demonstrates the application feasibility of oxygen vacancy enriched metal oxide in high optoelectronic gas sensing.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Chuan Luo,Zining Wang,Tianxiang Xia,Zhengang Zhao
The escalating emissions of nitrogen dioxide (NO 2 ) resulting from rapid industrialization pose a severe threat to both ecological balance and public health, rendering the development of high-performance NO 2 sensors imperative for precise environmental monitoring. However, conventional metal oxide semiconductor (MOS) sensors based on pristine materials suffer from intrinsic limitations, including low sensitivity, poor humidity tolerance, and high operating temperatures. Single-mode modification strategies often fail to simultaneously mitigate these drawbacks. Herein, we propose a synergistic modification strategy combining rare-earth doping with heterojunction engineering. Ce-doped SnO 2 /ZnO nanocomposites were successfully synthesized via a facile hydrothermal method. Among the fabricated devices, the S 5 CZ 5 sensor (1:1 mass ratio) exhibited superior performance, delivering a robust response of 55.3 to 100 ppm NO 2 at 180 °C, accompanied by rapid response/recovery kinetics (21 s/29 s) and a low theoretical detection limit of 843 ppb. Notably, the incorporation of Ce effectively modulated surface wettability, endowing the sensor with exceptional moisture resistance and long-term stability. Furthermore, density functional theory (DFT) calculations elucidated the atomic-scale mechanism: the ternary SnO 2 /Ce-ZnO system yields an exceptionally high NO 2 adsorption energy (−2.55 eV) and a massive interfacial charge transfer (0.49 e), while critically suppressing H 2 O interactions (adsorption energy of −0.40 eV, restricted charge transfer of 0.13 e), as corroborated by charge density difference analyses. Coupled with an optimized density of states near the Fermi level, this work achieves a multidimensional enhancement of sensing performance, offering novel insights for trace gas detection in complex environments.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2026
·
IF 12.2
Ya Zhao,Chong Wang,Yingqi Zhao,Yufeng Shao,Hua Xie,Jiayue Yang,Weiqing Zhang,Guorong Wu,Gang Li,Ling Jiang,Xueming Yang
Elucidating the impacts of gaseous pollutants on secondary organic aerosol (SOA) formation mechanisms is critical for developing effective PM2.5 mitigation strategies. However, the combined effects of NOx (NOx = NO2 + NO) and SO2 on SOA compositions under complex photochemical conditions remain mechanistically unresolved. Here, we investigated the individual roles of NO2/NO and their combined effects with SO2 on β-myrcene photooxidation. Our results showed that NO2 enhanced the SOA yield and the O:C ratio through oxidant amplification, whereas NO suppressed nucleation and oxidation states of products but facilitated particle size growth via organic nitrate partitioning. SO2 exhibited significant synergistic effects with both NO2 and NO, facilitating particle formation and growth processes. The newly built vacuum ultraviolet free electron laser photoionization aerosol mass spectrometer enabled the observation of a series of new compounds (i.e., organic peroxides, organic nitrate, and organosulfates) and identified new mechanisms of SOA formation. Notably, a novel compound with a molecular weight of 287 was characterized to be a nitrogen- and sulfur-containing species. These findings highlight the critical roles of pollutants in particle formation in environmental processes and provide key scientific support for regional air quality management and climate change mitigation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xingyu Kang,Haibo Yu,Xiao Ma,Eryang Shang,Hong Chen,Huizhang Zhao,Jiawei Zhang,Rong Tan,Dong Wang,Hairui Fang
An efficient portable gas sensor was developed to meet the needs of air quality monitoring, for the detection of nitrogen dioxide (NO 2 ). In this study, coaxial electrospinning technology was used to synthesize porous nanofibers of indium oxide (In 2 O 3 ) composite zinc oxide (ZnO), which are recognized as special semiconductor ceramic materials. The best sample (NFs.1–6) consists of a nanoparticle-based structure with interconnected pores, in contrast to the more compact, tightly bonded nanofibers. This porous structure enhances gas adsorption capacity, improving the sensor’s performance. At 200 °C, the synthesized In 2 O 3 @ZnO (NFs.1–6) nanofibers exhibited a high response value of 171.25 and a fast response time of 5 s to 100 parts per million (ppm) NO 2 . The excellent characteristic is attributed to its uniform structure and n-n homojunction, making the response values 38 times and 98 times that of pure ZnO and pure In 2 O 3 , respectively. Building on the research findings, a smart mask was developed that incorporates the nanofiber sensor to monitor NO 2 concentrations in the air, offering an innovative approach to wearable gas sensor technology by semiconductor ceramic materials.
研究领域:
材料科学
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环境科学
·
传感器技术
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 42
·22859-22867
·
IF 11.9
Jinhong Yang,Haoran Peng,Chong Lin,Qingjiang Pan,Lixue Qi,Li Li,Keying Shi
To overcome the drawbacks of low sensitivity and limited selectivity exhibited by metal oxide sensitive materials, a metal–organic framework (MOF) derived composite (marked as UZZ) was constructed via a combined wet chemical method. UiO-66 was used as the precursor with the introduction of ZnO. The ZrO2 component in UZZ retains the unique octahedral configuration of UiO-66; on its folded surface, a large number of ZnO particles grow, whose sizes range from 20 to 40 nm. The composite exhibits excellent gas sensitivity to NO2 at room temperature. Exemplarily, the gas sensitive response to 100 ppm NO2 is 40.35, with a response time of 1.4 s and a detection limit as low as the 50 ppb level, and the stability is up to 8 weeks. The presence of numerous oxygen vacancies and n–n type heterojunctions on the surface of the UZZ composite synergistically enhances the gas-sensing performance. This finding provides a significant reference for developing new efficient and high-sensitivity metal oxide sensitive materials based on MOFs.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Xiaoqing Wang,Huiyi Chen,Jihui Zhang,Hong Zhou,Xiangying Meng,Na Wang,Yishan Fang,Bo Cui
The detection of Escherichia coli ( E. coli ) is of great significance for the environment and human health. Herein, a photoelectrochemical (PEC) detection strategy based on molecularly imprinted polymers (MIPs) was proposed for the sensitive detection of E. coli . 4,4′,4″-Trinitrotriphenylamine (TPA-NO 2 ) was prepared using a simple nitration reaction. Subsequently, MIP films were polymerized on the surface of TPA-NO 2 using 1,3-dihydrothieno[3,2- d ]pyrimidine-2,4-dione as the functional monomer with the dual functions of specific recognition and sensitization. The linear range was 10–10 8 CFU/mL and the limit of detection was 10 CFU/mL. It showed favorable recoveries in real sample tests of milk, orange juice and tomato. Additionally, the ability of functional monomers to bind excellently with E. coli was verified using molecular docking techniques. This research provided broader possibilities for constructing MIPs-PEC sensors and analyzing the interaction mechanism between E. coli and functional monomers.
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ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Qiang Xie,Lu Wang,Yangyang Zhu,Qiang Sun,Lijuan Wang
NO 2 gas sensors based on organic field effect transistors (OFETs) with alumina/poly(methyl methacrylate) (Al 2 O 3 /PMMA) bilayer dielectrics were prepared by sol-spin coating method. The sensors with 0.8 mol/L Al 2 O 3 -sol dielectric layer show a high NO 2 response, low baseline drift, stable sensing performance, and fast response/recovery time at room temperature . The sensitivity is over 129%/ppm and the limit of detection is below 1 ppm (134%). The results are comparable to most organic devices. The high sensor properties were attributed to the more ordered films on the dielectric layer and better electrical properties with bilayer dielectric devices than those with single dielectric devices. Compared to OFETs with PMMA single dielectric, the mobility was improved above 23 times, threshold voltage was reduced by 32.47 V, and both on-off current radio and saturation current were improved above an order of magnitude for OFETs with Al 2 O 3 /PMMA bilayer dielectrics at 0.8 mol/L Al 2 O 3 -sol. Moreover, the mechanism of organic film growth and the effect of bilayer dielectrics on sensing properties were analyzed. It is revealed that the highly electrical and NO 2 sensing properties are closely relate. A simple and effective method, the sol-spin coating method, was provided to obtain high performance NO 2 gas sensors based on OFETs.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Ziying Wang,Tong Zhang,Chen Zhao,Tianyi Han,Teng Fei,Sen Liu,Geyu Lu
In this work, we have reported a novel NO 2 sensor using molybdenum disulfide nanoparticles (MoS 2 NPs) decorated RGO (MoS 2 -RGO) hybrids as sensing materials, where MoS 2 -RGO hybrids were prepared by a two-step wet-chemical method. Firstly, MoS 2 NPs prepared by modified liquid exfoliation method from bulky MoS 2 powder. Then, MoS 2 -RGO hybrids were obtained by self-assembly of MoS 2 NPs and GO nanosheets, followed by a facile hydrothermal treatment progress. The combined characterizations indicate that MoS 2 NPs with the size of 3–5 nm are uniformly dispersed on RGO nanosheets. Most importantly, the sensor based on MoS 2 -RGO hybrids could detect NO 2 at room temperature. To further improve sensing performances, especially response and recovery rate, sensing properties are further examined by increasing the operation temperature to 160 °C. It is notably seen that MoS 2 -RGO-based NO 2 sensor not only shows improved sensitivity to NO 2 compared to pure RGO-based sensor, but also exhibits fast response and recovery characteristics (response time and recovery time are 8 s and 20 s toward 3 ppm NO 2 ). This work paves a new way for application of MoS 2 and RGO in chemical sensors, providing an effective method for fabrication of NO 2 sensors with high sensitivity and fast response/recovery rate.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Hairui Fang,Jiawei Zhang,Eryang Shang,Hong Chen,Xiao Ma,Xingyu Kang,Huizhang Zhao,Yuxia Liu,Dong Wang
Metal oxides are widely used because of their simple structure, low price, and excellent gas-sensitive properties. But now, the metal oxide sensor faces two challenges. One is that when the detection limit of the sensor is low, it will be affected by a high concentration of gas and fail in practical applications. Second, the metal oxide sensor is susceptible to temperature changes, resulting in inaccurate measurement results. To address the above problems, the performance of metal oxides is enhanced through doping. Indium oxide doped with various levels of indium molybdate was prepared using a two-step hydrothermal method resulting in a composite material with an n-n heterostructure. The interaction formed by the n-n heterostructure enhances the redox reaction between NO 2 gas and the sensor, and the unique nano cluster structure provides more active sites for the sensor, significantly improving the gas performance of the sensor towards NO 2 . Sensors based on In 2 (MoO 4 ) 3 with a doping ratio of 4 % (the sample IM3) showed excellent gas sensitivity. The lower and upper detection limits of the sensor are 200 ppb (response is 1.46) and 150 ppm (response is 515.94), respectively. And the sensor has good resistance to ultra-high concentration (10000 ppm) nitrogen dioxide (NO 2 ) impact. In the range of 130–170°C, the temperature has a small and linear effect on the sensor response, which is very beneficial for temperature correction of gas sensors. The sensor prepared by In 2 (MoO 4 ) 3 doped In 2 O 3 composite material has a good potential for application in engineering practice.
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