SENSORS AND ACTUATORS B-CHEMICAL
·
2025
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IF 7.7
Jinyong Hu,Yu Zhao,Bohao Liu,Yong Zhang
The exploitation of visible-light-activated gas sensors based on molybdenum disulfide (MoS 2 ) has been extensively investigated and is expected to hold tremendous potential in emerging fields of indoor gas sensing applications activated by daylight lamp. Enlightened by the localized surface plasmon resonance (LSPR) effect of Au nanoparticles in visible light spectrum and the abundant active sites of SnS quantum dots, an indoor white light activated gas sensor based on Au@MoS 2 /SnS nanocomposites is rationally developed for the high sensitive detection of nitrogen dioxide (NO 2 ). Under the white light irradiation, the as-proposed gas sensor demonstrates an enhanced response exceeding 25-folds toward 1 ppm of NO 2 compared with the pristine MoS 2 gas sensor. Moreover, the white light-activated Au@MoS 2 /SnS gas sensor manifests excellent repeatability, rapid response/recovery speed (7/8 s), ppb-level detection limit, favorable long-term stability, and remarkable selectivity toward NO 2 . These enhanced gas sensitive performances principally stem from the interfacial charge transfer effect within the Au@MoS 2 /SnS composite material and the multiplied gas-sensitive pathways facilitated by the LSPR effect originating from the Au nanoparticle cores. This work paves an efficacious avenue for the development of high-performance gas sensitive devices operable at room temperature, thereby facilitating innovative advancements of gas sensing technology in various Internet of Things (IoTs) applications.
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高影响因子
ACS Sensors
·
2025
·
IF 9.1
Zhenliang Li,Yuan Ren,Yujian Rao,Rui Ma,Ao Xu,Zejun Han,Tuo Zhang,Xueqiong Cui,Qiongfeng Shi,Li Tao
A rapid and highly sensitive detection of harmful gas molecules is crucial in artificial olfaction (electronic nose), which plays a significant role in areas such as environmental monitoring and healthcare. However, it remains a significant challenge to construct highly sensitive molecular sensors with fast response at room temperature due to the limitations in structures and properties (e.g., porosity, crystallinity, and carrier mobility) of the sensing materials. Herein, this study proposes a facile method to enable highly crystalline mesoporous WSe2/WO3 (m-WSe2/WO3) semiconductor heterostructures through controllable interfacial self-assembly of polyoxometalate (POM) clusters and amphiphilic block copolymers combined with a thermal-assisted conversion process. It allows uniform pore size, open channels, large specific surface area, highly crystalline framework, and abundant transition metal chalcogenide/metal oxide heterojunction interfaces. The m-WSe2/WO3-based chemiresistive semiconductor sensor achieves efficient detection of NO2 at room temperature, including ultrafast response (5 s), high selectivity (SNO2/Sgas > 5), high sensitivity (62.5%@50 ppm), low detection limit (50 ppb), and long-term stability (>30 days). Thanks to the synergistic improvement of sensing dynamics between mesostructure and heterojunction, such a few-second response time has been reduced by half of the reported values in most existing counterparts based on two-dimensional materials. Our work paves the way for the application of high-performance and cost-effective molecular sensors in artificial olfaction, electronic skins, and wearable integrated circuits at room temperature.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yangyang Huo,Dongnan Zhang,Ying Yang,Zhiguang Pan,Hui Yu,Tianqi Wang,Xiangting Dong
Enhancing the stability and selectivity of flexible room-temperature gas sensors has been of extensive concern for their practical application. However, it is very challenging to combine the integration of excellent mechanical flexibility and outstanding gas sensing properties. This study presents the design of a parallel structure of ZnO//In2O3 bicomponent nanofibers using a homemade V-type dual-channel electrospinning technique. Compared with as-electrospinning pure ZnO nanofibers and pure In2O3 nanofibers, the ZnO//In2O3-2 composite nanofibers showed higher response and low detection line NO2 at room temperature. The ZnO//In2O3-2 nanofibers have a maximum high response of 109.84 to 60 ppm of NO2 at room temperature, which is about 8.44 times higher than that of the pure In2O3 nanofibers. Moreover, the theoretical detection limit for NO2 is determined to be 1.99 ppb. We have investigated the excellent flexibility of the gas sensor for potential application. These findings indicate that the flexible ZnO//In2O3-2 nanofiber sensors hold great prospect in the application of portable and room-temperature ppb NO2 detection equipment.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Sitong Feng,Lingchu Huang,Qi Lu,Tong Wang,Rui Han,Xiaoyong Sun,Xishuang Liang,Fengmin Liu,Fangmeng Liu,Geyu Lu
The fuel cell type gas sensor has attracted wide attention due to its advantages of operating at room temperature, low power consumption and good stability. In this study, a new sensitive electrode material Au-Ni/CF was developed for the detection of NO 2 . Through XRD , SEM and TEM characterization, it has been demonstrated that the electrode material exhibits improved crystallinity after being sintered at high temperatures. This leads to a reduction in charge transfer impedance. Additionally, XPS testing and TEM characterization have confirmed that high temperature sintering results in the reduction of more metal elements, leading to an increase in the electrochemical surface area and effectively improving sensor sensitivity. Furthermore, adjusting the mass ratio of gold to nickel can alter the surface lattice arrangement and electronic structure of the electrode material, subsequently impacting its resistance and catalytic ability towards NO 2 , ultimately enhancing sensor sensitivity. The sensitivity of the sensor using Au 5 Ni 2 /CF as the electrode material for detecting 0.05–10 ppm NO 2 was found to be 47.88 nA/ppm with response and recovery times of 35 s and 25 s respectively when exposed to 2 ppm NO 2 . Furthermore, it exhibited good selectivity and stability, indicating promising potential for application in room temperature atmospheric environment monitoring.
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ATMOSPHERIC ENVIRONMENT
·
2022
·
IF 5.755
Xi Xi,Xiang He,Zhi-Cheng Ma,Hui-Qing Ma,Peng-Cheng Liao
Formation processes of nitrogen-containing organic compounds (NOCs) are important from heterogeneous reactions between volatile organic compounds (VOCs) and mineral oxides under various environmental factors. In this study, reaction processes of C 3 H 6 /O 3 /NO 2 with α-Fe 2 O 3 particles were studied by using a gas-flow system with diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The results show that the appearance of R–ONO 2 bands at ∼1648 and 1286 cm −1 represents the formation of NOCs. In the dark condition, the presence of O 3 leads to the rapid formation of nitrate radical (NO 3 ) which can react with C 3 H 6 to form NOCs on particle surface. Under the simulated sunlight irradiation, the α-Fe 2 O 3 can be excited to produce additional hydroxyl which promotes the formation of RO 2 . Meanwhile, formed NO from the photolysis of NO 2 can react with RO 2 to produce more NOCs. Moreover, the presence of water vapor plays a negative role in the NOCs formation processes. The value of uptake coefficient for the NO 2 in the initial stage at 0% relative humidity (RH) is about 10 times higher than that at 76.3% RH during the heterogeneous reactions. The R–ONO 2 group hydrolyzes to nitric acid and R–OH under the humid condition. Our results lay the foundation on the effects of light irradiation and RH for the converting VOCs into NOCs on mineral dust and help to understand the formation processes of NOCs under combined atmospheric environment.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Jiahui Fan,Guiting Wang,Rui Zhang,Xu Guo,Kun Li,Junwei Zhou,Jingfeng Wu,Kai Pan,Keying Shi
High-performance gas-sensitive materials must exhibit improved resistance to moisture essential criterion for their effectiveness. In this work, monodisperse triangle MnO nanocrystals were synthesized through the hot injection method. Then, they were evenly spread across the reduced graphene oxide (rGO) surface in a uniform dispersion. The optimized MnO/rGO exhibited high sensitivity (R a /R g =47.0) and quick response, with a lower detection limit. Furthermore, it shows strong moisture resistance in a high-humidity environment (80 % relative humidity). The comprehensive wrapping of stearate ligands proved highly effective in preventing water vapor infiltration. This robust shielding significantly boosted the composite's hydrophobic nature, markedly enhancing its resistance to moisture. This approach offers a pioneering avenue for gas sensors to detect NO 2 effectively at room temperature, even within high-humidity environments.
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RARE METALS
·
2025
·
IF 11
Qiu-Yue Zheng,Xiao-Li Cheng,Jing Tang,Ting-Ting Wang,Xian-Fa Zhang,Li-Hua Huo,Chao-Bo Huang,Zoltán Major,Yong-Sheng Zhang,Peng-Jin Ye,Ying-Ming Xu
en Introducing oxygen vacancies has emerged as an essential strategy to affect the sensing properties of nanomaterials. However, existing methods for manipulating oxygen require high cost, complex operation, and harsh conditions. Herein, a simple NH 4 + -assisted heat treatment approach was designed to regulate the concentration of oxygen vacancies of ammonium tungsten bronze ((NH 4 ) 0.25 WO 3 , named as NWO). The resultant NWO-300 sensor exhibited an extremely high response of 118 to 1 ppm NO 2 at 40°C. It achieved a detection limit as low as 10 ppb. Such outstanding sensing properties of NWO-300 were ascribed to the modulated electronic structure and increased active sites caused by oxygen vacancies. The formation of a large number of oxygen vacancies in NWO-300 is due to the H and N atoms in NH 3 can extract O atoms on the surface of materials, which was confirmed by X-ray photoelectron spectroscopy (XPS) and thermogravimetric-mass spectrometry (TG-MS) techniques. Moreover, the excellent NO 2 detection ability of the NWO-300 sensor enables the detection of air quality under different floors, and its development can be utilized in the field of environmental monitoring applications. 摘要 zh 引入氧空位已成为影响纳米材料传感性能的一项关键策略。然而, 现有调控氧空位的方法成本高昂、操作复杂且条件苛刻。因此, 设计了一种简单的NH 4 + 辅助热处理方法来调节铵钨青铜 ((NH 4 ) 0.25 WO 3 , 命名为NWO) 中氧空位的浓度。制备的NWO-300传感器在40 °C时对1 ppm 的NO 2 显示出高达118的响应, 其检测限低至10 ppb。NWO-300传感器如此出色的传感性能归因于氧空位所导致的电子结构的调节和活性位点的增加。NWO-300中大量氧空位的形成是由于NH 3 中的H和N原子可以从材料表面提取O原子, 这一点通过XPS和TG-MS技术得到了证实。此外, 由于NWO-300传感器出色的NO 2 检测能力使其能够检测不同楼层的空气质量, 其开发可用于环境监测领域。
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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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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
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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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
·
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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