SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Haineng Bai,Cheng Feng,Hui Guo,Xiaoli Li,Weifeng Liu,Yamin Feng,Kuili Liu,Dunjun Chen,Youdou Zheng,Fuqiang Guo
Monitoring and reducing NO 2 pollution at room temperature is indispensable for human survival. Thus, we propose a light-activated route (UV light, 100 mW/cm 2 ) to realize a high-performance NO 2 detection based on CuO/rGO gas sensor. The CuO/rGO sensor under UV light illumination exhibits a high response of 22.18–100 ppm NO 2 at 23 ℃, which is approximately 1.36 times of the CuO/rGO sensor and 2.31 times of the CuO sensor under dark, respectively. Meanwhile, under UV light illumination, the CuO/rGO sensor has a fast response/recovery speed of 10.9/30.9 s to 20 ppm NO 2 at 23 ℃, which is obviously better than that under dark. Moreover, the light-activated CuO/rGO sensor has excellent repeatability, selectivity, ultra-low detection limit (50 ppb) and long-term stability. The significantly appealing gas-sensing performance of CuO/rGO sensor is mainly ascribed to the mesoporous structure, high specific surface area and plentiful oxygen vacancy of CuO/rGO nanocomposites . More attractively, the photo-generated carriers and formed heterojunction also greatly improve the carrier migration in the context of the NO 2 /CuO/rGO interaction, enhancing the gas-sensing performance of gas sensor. Our work will provide insight in utilizing light illumination to realize ultrasensitive and room-temperature detection of ppb-level NO 2 gas.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
ACS Sensors
·
2024
·
IF 8.2
Huimin Yang,Zhenming Du,Yazhou Yang,Qirui Wu,Chaofan Ma,Huiyu Su,Xiaoxia Wang,Dawen Zeng
Developing gas sensors capable of efficiently detecting harmful gases is urgent to protect the human environment. Here, an active Ce–Ag bimetallic pair was innovatively introduced into SnS2, which successfully exhibited excellent NO2 gas sensing performance. 0.8% Ce–SnS2–Ag showed a gas sensing response of 5.18 to 1 ppm of NO2 at a low temperature of 80 °C, with a lower limit of detection as low as 100 ppb. DFT calculations revealed that Ce atoms are substituted into the main lattice of SnS2, which opens up the interlayer spacing and serves as an anchor point to fix the Ag atoms in the interlayer. The Ce–Ag bimetallic pairs successfully modulate the electronic structure of SnS2, which promotes the adsorption and charge transfer between NO2 and Ce–SnS2–Ag and thus achieves such an outstanding gas sensing performance. This work opens an avenue for the rational functional modification of SnS2 with an optimized electronic structure and enhanced gas sensing.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sensors
·
2024
·
IF 8.2
Chengming Sui,Mingxue Zhang,Yueyue Li,Yilin Wang,Yuanzhen Liu,Ziqi Liu,Jihao Bai,Fengmin Liu,Geyu Lu
Bimetallic nanocrystals (NCs) have obtained significant attention due to their unique advantages of the intrinsic properties of individual metals and synergistic enhancements resulting from the electronic coupling between two constituent metals. In this work, Pd@Pt core–shell NCs were prepared through a facile one-pot solution-phase method, which had excellent dispersion and uniform size. Concurrently, ZnO nanosheets were prepared via a hydrothermal method. To explore their potential in nitrogen dioxide (NO2) gas sensing applications, sensitive materials based on ZnO nanosheets with varying mass percentages of Pd@Pt NCs were generated through an impregnation process. The sensor based on 0.3 wt % Pd@Pt-ZnO exhibited remarkable performance, demonstrating a substantial response (Rg/Ra = 60.3) to 50 ppb of NO2 at a low operating temperature of 80 °C. Notably, this sensor reached an outstanding low detection limit of 300 ppt. The enhancement in gas sensing capabilities can be attributed to the sensitization and synergistic effects imparted by the exceptional catalytic activity of Pd@Pt NCs, which significantly promoted the reaction. This research introduces a novel approach for the utilization of core–shell structured bimetallic nanocrystals as modifiers in metal-oxide-semiconductor (MOS) materials for NO2 detection.
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
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Qiang Liu,Lei Gao,Xingsong Su,Fei Zhou,Guotao Duan
The cobalt phthalocyanine (CoPc) resistance-type sensors to NO 2 were prepared using CoPc thin films via interfacial self-assembly method. Their sensing performances were investigated with respect to different NO 2 concentrations from 1 to 50 ppm. It was found that the CoPc sensors show excellent sensing performance: relatively low temperature (115 °C), high sensitivity (2.7–10 ppm NO 2 with a detection limit of 1 ppm), fast response and recovery (response time ∼26 s and recovery time ∼34 s at 3 ppm of NO 2 ), and excellent stability (almost the same after 4 weeks), reliability and selectivity towards NO 2 . Further, the sensitivity showed a quasi-linear relationship versus the concentration of NO 2 in the ranges of 1–50 ppm. On account of their high performances, the prepared CoPc thin films via interfacial self-assembly method will provide a high-efficiency sensor for practical NO 2 sensing 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
ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Lu Zhang,Zhongjun Li,Jiang Liu,Zhengchun Peng,Jia Zhou,Han Zhang,Yingchun Li
Two-dimensional (2D) transition-metal/metal chalcogenides including MoS2, MoSe2, WS2, SnS2, etc. have shown considerable potential for the fabrication of gas sensors for NO2 detection. However, these sensors usually suffer from sluggish and incomplete recovery at room temperature, and their sensitivities are limited by presorbed O2. In this work, a novel optoelectronic gas sensor based on direct-bandgap InSe nanosheets was demonstrated. Because of the excellent photoelectric and sensing properties in few-layer InSe, detection of NO2 at room temperature was realized. Ultrahigh and reversible responses were obtained under ultraviolet (UV) light illumination, and the limit of detection (0.98 ppb) was ∼40 times lower than that observed without UV light. Furthermore, the effects of O2 and H2O molecules on sensor performance were fully studied through experiments and density functional theory. Some new mechanisms of NO2 detection in high relative humidity conditions under UV illumination were proposed, including regulation of proton transfer and induction of H2O2 reduction. In all, this work not only broadens the application field of 2D InSe, but also demonstrates the potential prospect of detecting ppb-level NO2 in complex circumstances such as human breath by using 2D material-based sensors with light activation.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
高影响因子
Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-14
·
IF 36.3
Zhong Yihong,Yuan Guotao,Bao Dequan,Tao Yi,Gao Zhenqiu,Zhao Wei,Li Shuo,Yang Yuting,Zhang Pingping,Zhang Hao,Sun Xuhui
The heteroatom atomically doping strategy was reported to construct highly
efficient sites on metal oxides for the detection of low-concentration gas.
The atomically dispersed Sn atoms were intentionally incorporated into the Fe 2 O 3
lattice during the oxidative annealing of Fe-based metal organic framework,
leading to specific Sn–O–Fe sites, porous structures, and abundant oxygen
vacancies.
The optimized Sn-Fe 2 O 3 exhibited exceptional sensing performance for NO 2
detection: ultra-high sensitivity ( Rg / Ra =2646.6 to 1 ppm NO 2 ), ultra-low limit of
detection (10 ppb), and high selectivity.
研究领域:
材料科学
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环境监测
·
化学传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yaodan Zhang,Yuanchao Xie,Hongtao Wang,Dan Han,Shengbo Sang
It is essential to improve the detection response and maintain good stability of the gas sensor to be able to effectively monitor the ppb level harmful NO 2 gas. This work was dedicated to improving the sensing performance of NO 2 gas sensors by synthesizing flower-like structure SnO 2 /GaN composites using a combination of solvothermal and ultrasonic mixing method. The introduction of GaN increased the specific surface area of SnO 2 and provided more adsorption sites. Gas-sensitive test results showed that the SnO 2 /GaN composites exhibited excellent NO 2 response (42–1 ppm of NO 2 ) and lower detection limit (100 ppb) at lower operation temperature of 130 °C. In addition, the fluctuation in the initial resistance and response of the SnO 2 /GaN composites to 20 ppm of NO 2 within one month were small. The improved sensing performance was attributed to the unique flower-like structure of SnO 2 , the excellent thermodynamic stability of GaN and the heterogeneous interface of SnO 2 /GaN. This work provides a new design strategy for the development of highly sensitive ppb-level NO 2 sensors for atmospheric environmental monitoring.
研究领域:
材料科学
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环境科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Nano Express
·
2021
·Vol. 2
·期 2
·020021
·
IF 0
Guoliang Chen,Suyang Lu,Yunfan Shang,Wenwen Zeng,Haoran Zhan,Jun Mei,Zhoukun He
In this work, monophasic Sn3O4 and biphasic Sn3O4-SnO2 heterostructure composed of plentiful nanosheets were synthesized by using a simple one-step solvothermal method. Their morphology, structure, and composition were characterized by XRD, XPS, SEM and TEM. Also their NO2 sensing performance were tested systematacially. The results demonstrated that the gas sensor based on the Sn3O4-SnO2 composites exhibits excellent NO2 sensing performance including low operating temperature, high sensitivity and outstanding selectivity. Its sensitivity to 1 ppm NO2 is as high as 1395.0 ppm−1 while the operating temperature is as low as 50 °C. Its excellent NO2 sensing performance could be attributed to the formation of Sn3O4-SnO2 heterojunction which modulated the electrons effectively, abundant oxygen vacancies and high specific surface area which enhanced the adsorption of NO2.
研究领域:
材料科学
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环境监测
·
传感器技术
✓ 已验证
产品关联
DOI
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2016
·Vol. 32
·期 6
·924-928
·
IF 1.086
Qi Pengjia,Wang Ziying,Wang Rui,Xu Yinan,Zhang Tong
Synthetic graphene composite was modified on a transducer of quartz crystal microbalance(QCM) to fabricate a gas sensor for low concentration nitrogen dioxide(NO 2 ) detection. The gas sensing properties of the QCM coated with SnO 2 -rGO and AgNPs-SnO 2 -rGO composites were investigated when exposing QCM to low NO 2 con-centration(2.05—20.5 mg/m 3 ) atmosphere at room temperature. The sensing performances of the QCM with AgNPs-SnO 2 -rGO composites were enhanced by the introduction of Ag nanoparticles, and the QCM modified with AgNPs-SnO 2 -rGO composites could detect NO 2 at room temperature.
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
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Yunpeng Wang,Yue Niu,Ruiting Hao,Jing Zhou,Meng Guo,Ying Liu,Wenbo Liu,Yanwei Chang,Hao Li,Yao Wang,Guofu Zhou
Structure nanocrystallization dramatically enhances the specific surface area and is one of the most popular methods for preparing high-performance gas sensing materials. However, most of the preparation methods are suffering high-cost and long time-consuming. This work synthesized Cu 2 ZnSnS 4 (CZTS), a cost-effective and stable direct-bandgap semiconductor with cauliflower-like morphology by facile solution drop coating and low-temperature annealing. The morphology and gas sensing performance of CZTS films could be modulated by controlling the annealing time. The gas sensors showed a significant response toward ppb-level NO 2 (1.287 toward 50 ppb) with a short response, recovery time, and high selectivity at room temperature (25 °C). It is worth mentioning that the limit of detection is 50 ppb, which is the first report on the ppb-level detection ability of CZTS-based NO 2 gas sensors. The enhanced sensitivity of the cauliflower-like CZTS nanocrystal-based gas sensor can be ascribed to the small grain size, large specific surface area for effective gas diffusion, and excellent conductivity of the spherical packed structure.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Fuqiang Guo,Cheng Feng,Zheng Zhang,Lili Zhang,Chang Xu,Congting Zhang,Shuang Lin,Huanxing Wu,Baohua Zhang,Aersi Tabusi,Yineng Huang
In this paper, the Ti 3 C 2 T x /CuO nanocomposites were successfully prepared by an environment-friendly and simple hydrothermal method . The synthetics are evaluated using a series of characterization techniques, such as XRD , SEM, TEM , XPS , FTIR, UV–vis, and BET techniques. The results show that Ti 3 C 2 T x /CuO nanocomposites are mesoporous and have a higher specific surface area than Ti 3 C 2 T x , confirming the presence of more gas adsorption/diffusion regions. Furthermore, the Ti 3 C 2 T x with the introduction of CuO has rich oxygen vacancies and adsorbed oxygen. In particular, the response of Ti 3 C 2 T x /CuO sensor (56.99%) is 5 times higher than that of Ti 3 C 2 T x (11.17%) sensor to 50 ppm NO 2 at room temperature (RT). Especially, the Ti 3 C 2 T x /CuO sensor exhibits ultra-fast response/recovery time (16.6/31.3 s to 20 ppm NO 2 ), great reversibility , outstanding selectivity to NO 2 , and desirable long-term stability (over 40 days). The enhanced gas sensing performance may be attributed to the formation of hybrid heterojunctions between CuO and Ti 3 C 2 T x that provide carrier migration channels to hasten the redox reaction . At the same time, Ti 3 C 2 T x /CuO possesses more oxygen vacancies and adsorbed oxygen than Ti 3 C 2 T x , which will reduce the required energy for gas adsorption to further enhance the gas sensing performance. Hopefully, the above improved gas sensing performance indicators modified with CuO are expected to become the advantage of constructing Ti 3 C 2 T x -based sensor, which will be put into commercial NO 2 detection in the future.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2023
·
IF 8.9
Huajing Wang,Zhou Cui,Rui Xiong,Xiaoxia Wang,Wulin Song,Xiang Guo,Xiao Wu,Baisheng Sa,Dawen Zeng
Although two-dimensional (2D) transition-metal dichalcogenides (TMDs) exhibit attractive prospects for gas-sensing applications, the rapid and precise sensing of TMDs at low loss remains challenging. Herein, a NO2 sensor based on an expanded VS2 (VS2-E)/carbon nanofibers (CNFs) composite (abbreviated as VS2-E-C) with ultrafast response/recovery at a low-loss state is reported. In particular, the impact of the CNF content on the NO2-sensing performance of VS2-E-C was thoroughly explored. Expanded VS2 nanosheets were grafted onto the surface of hollow CNFs, and the combination boosted the charge transport, exposing abundant active edges of VS2, which enhanced the adsorption of NO2 efficiently. The activity of the VS2 edge is further confirmed by stronger NO2 adsorption with a more negative adsorption energy (−3.42 eV) and greater than the basal VS2 surface (−1.26 eV). Moreover, the exposure of rich edges induced the emergence of the expanded interlayers, which promoted the adsorption/desorption of NO2 and the interaction of gas molecules within VS2-E-C. The synergism of edge effect and interlayer engineering confers the VS2-E-C3 sensor with ultrafast response/recovery speed (9/10 s) at 60 °C, high sensitivity (∼2.50 to 15 ppm NO2), good selectivity/stability, and a low detection limit of 23 ppb. The excellent “4S” functions indicate the promising prospect of the VS2-E-C3 sensor for fast and precise NO2 detection at low-loss condition.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
PubMed
高影响因子
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