KEY ENGINEERING MATERIALS
·
2016
·
IF 0
Jian Wu,Cheng Zhang,Jin Feng Xia,Dan Yu Jiang
In this study, Yttria-stabilized zirconia (YSZ) electrochemical sensors attached with the WS2 sensing electrode (SE) were fabricated and examined for NO2 sensing properties. Due to its internal stratiform structure, surface and edge of the lamella have high chemical activity, WS2 was used as a kind of highly efficient catalyst. WS2 was partial oxidated to WO3 at 400°C, and with the increment of temperature, oxidation will accelerate. The ΔEMF to 500 ppm NO2 was as high as 125mv at 400°C, while the value of WO3-based sensor was as small as 10 mv in the same condition. These WS2-attached devices gave a linear correlation between EMF and the logarithm of NO2 concentration from 30 to 500 ppm in the temperature range 350–500°C. The response time of the device is about 1 min at 400°C.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
CHEMISTRY-A EUROPEAN JOURNAL
·
2020
·Vol. 26
·期 17
·3870-3876
·
IF 4.857
Xiaoshan Wang,Yao Liu,Jie Dai,Qian Chen,Xiao Huang,Wei Huang
Graphical By taking advantage of the crystal phase dependent electronic property of SnSe x based materials, SnSe( x %)/SnSe 2 (100− x %) p–n heterostructures were synthesized via a facile one-step colloidal method, and the SnSe(50 %)/SnSe 2 (50 %) based sensor exhibited much improved sensing performance due to the formation of p–n hetero-junctions. The formation of semiconductor heterostructures is an effective approach to achieve high performance in electrical gas sensing. However, such heterostructures are usually prepared via multi-step procedures. In this contribution, by taking advantage of the crystal phase-dependent electronic property of SnSe x based materials, we report a one-step colloid method for the preparation of SnSe( x %)/SnSe 2 (100− x %) p–n heterostructures, with x ≈30, 50, and 70. The obtained materials with solution processability were successfully fabricated into NO 2 sensors. Among them, the SnSe(50 %)/SnSe 2 (50 %) based sensor with an active layer thickness of 2 μm exhibited the highest sensitivity to NO 2 (30 % at 0.1 ppm) with a limit of detection (LOD) down to 69 ppb at room temperature (25 °C). This was mainly attributed to the formation of p–n junctions that allowed for gas-induced modification of the junction barriers. Under 405 nm laser illumination, the sensor performance was further enhanced, exhibiting a 3.5 times increased response toward 0.1 ppm NO 2 , along with a recovery time of 4.6 min.
研究领域:
材料科学
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化学传感器
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纳米技术
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 16
·2289
·
IF 5.3
Zhenyu Wang,Haizhen Ding,Xuefeng Liu,Jing Zhao
Semiconductor oxide gas sensors have important applications in environmental protection, domestic health, and other fields. Research has shown that designing the morphology of sensitive materials can effectively improve the sensing characteristics of sensors. In this paper, by controlling the solvothermal reaction time, a unique hexagonal flower-like structure of In2O3materials consisting of cuboid nanorods with a side length of 100–300 nm was prepared. The characterization results indicated that with the increase in reaction time, the materials exhibited significant morphological evolution. When the solvent heating time is 5 h, the flower-like structure is basically composed of hexagonal nanosheets with a thickness of several hundred nanometers and a side length of several micrometers. With the increase in reaction time, the apex angles of the nano sheets gradually become obtuse, and, finally, with the Ostwald ripening process, they become cuboid nanorods with side lengths of 100–300 nanometers, forming unique micro-flowers. Among them, the material prepared with a reaction time of 20 h has good sensing performance for NO2, exhibiting low operating temperature and detection limit, good selectivity, repeatability, and long-term stability, thus suggesting a good application prospect.Keywords:In2O3;micro-flowers;morphological evolution;NO2sensor;solvothermal
研究领域:
材料科学
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环境科学
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化学传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Heping Cui,Kai Zheng,Zhongjian Xie,Jiabing Yu,Xiangyi Zhu,Hao Ren,Zeping Wang,Feng Zhang,Xiandong Li,Lu-Qi Tao,Han Zhang,Xianping Chen
Industrial production, environmental monitoring, and clinical medicine put forward urgent demands for high-performance gas sensors. Two-dimensional (2D) materials are regarded as promising gas-sensing materials owing to their large surface-to-volume ratio, high surface activity, and abundant surface-active sites. However, it is still challenging to achieve facilely prepared materials with high sensitivity, fast response, full recovery, and robustness in harsh environments for gas sensing. Here, a combination of experiments and density functional theory (DFT) calculations is performed to explore the application of tellurene in gas sensors. The prepared tellurene nanoflakes via facile liquid-phase exfoliation show an excellent response to NO2 (25 ppb, 201.8% and 150 ppb, 264.3%) and an ultralow theory detection limit (DL) of 0.214 ppb at room temperature, which is excellent compared to that of most reported 2D materials. Furthermore, tellurene sensors present a fast response (25 ppb, 83 s and 100 ppb, 26 s) and recovery (25 ppb, 458 s and 100 ppb, 290 s). The DFT calculations further clarify the reasons for enhanced electrical conductivity after NO2 adsorption because of the interfacial electron transfer from tellurene to NO2, revealing an underlying explanation for tellurene-based gas sensors. These results indicate that tellurene is eminently promising for detecting NO2 with superior sensitivity, favorable selectivity, an ultralow DL, fast response-recovery, and high stability.
研究领域:
材料科学
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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
Zhaorui Zhang,Jinkui Chu,Huashuai Hu,Haoming Sun,Xuefei Zhao,Haiying Du,Minghui Yang
Nitrogen dioxide (NO2) is a significant environmental and human health hazard. Current NO2 sensors often lack sensitivity and selectivity under ambient conditions. This study investigates ammonia pyrolysis modification of monolayer Ti3C2Tx MXene to enhance NO2 detection at room temperature. Nitrogen-doped Ti3C2Tx demonstrates a substantial improvement in sensitivity, with a response of 8.87% to 50 ppm of NO2 compared to 0.65% for the original sensor, representing a 13.8-fold increase. The nitrogen-doped sensor also exhibits superior selectivity and linearity for NO2 under ambient conditions. Theoretical analysis shows that nitrogen incorporation promotes enhanced interaction between Ti3C2Tx and its surface oxygen-containing functional groups through electronic hybridization, resulting in improved adsorption energy (1.80 |eV|) and electron transfer efficiency (0.67 |e|) for NO2, thereby enhancing its gas-sensing performance. This study highlights the potential of ammonia pyrolysis-treated Ti3C2Tx MXene for advancing NO2 sensor technologies with heightened performance at room temperature.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2019
·Vol. 25
·期 12
·6043-6050
·
IF 2.289
Diao Quan,Zhang Xiaomei,Li Jie,Yin Yuna,Jiao Mingli,Cao Jian,Su Chaohua,Yang Kai
The phenol-formaldehyde (PF) resin microspheres were firstly used as the template in the sensing electrode (SE) preparation process of sensors based on Y 2 O 3 stabilized ZrO 2 (YSZ). The PF resin microspheres were synthesized by a facile hydrothermal method. The high char yield and the few morphological changes of PF resin microspheres before and after sintering at 900 °C indicated the perfect thermal stability at high temperature. The sensors using MnCr 2 O 4 admixed with various contents PF microspheres (0 wt%, 5 wt%, 10 wt%, and 20 wt%) were fabricated and their sensing performances on NO 2 gas were also investigated. The sensor with sensing electrode prepared by MnCr 2 O 4 with 10 wt% PF showed the best NO 2 sensing performance with a response of 110.8 mV to 100 ppm NO 2 as well as the higher sensitivity (87.4 mV/decade) with the NO 2 concentration ranging from 10 to 500 ppm at 550 °C. According to the mixed-potential mechanism, the porous electrode is good for gas penetration, so the gas can easily reach the MnCr 2 O 4 /YSZ/gas triple phase boundary (TPB) to participate in the electrochemical reactions. Additionally, the sensor exhibited excellent selectivity and repeatability, which indicated its potential application in the NO 2 detection.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2019
·Vol. 5
·期 11
·1408-1417
·
IF 3.431
Qiqi Sun,Qi Liu,Lei Gong,Chiming Wang,Xia Kong,Chaoyi Yang,Weigang Feng,Dongdong Qi,Fangna Dai,Xiyou Li,Yanli Chen
Graphical Moisture-resistant : Remarkably specific sensors for NO 2 have been developed based on hierarchical self-assembly of porphyrin devices. They are effective sensors over a broad humidity range. A metal free meso -tetrakis(1-pyrenyl)porphyrin H 2 T[(Pyr) 4 ]P ( 1 ) and its cobalt congener CoT[(Pyr) 4 ]P ( 2 ) are firstly fabricated into the hierarchical nanopetals and micro-ball-flowers, respectively, by a simple solution-based method. Unexpectedly highly sensitive, stable, selective and reproducible responses to 50–400 ppb NO 2 gas are obtained at room temperature for the aggregates of both 1 and 2 , within 2 min dynamic exposure period at a broad relative humidity (RH) range of 0%-75%. In particular, the micro-ball-flowers of 2 achieve a sensitivity of 91.4 and 214% ppm −1 at 45% RH and 75% RH, respectively, demonstrating the potentials as chemical sensors operating in real-world atmospheres. Furthermore, the sensitivity of 1 and 2 remains almost unchanged under 0%–75% RH after 6 months. The present work represents one of the best results among organic-based ppb-level NO 2 sensors operating under a broad RH range in terms of sensitivity and stability to humidity variations at room temperature.
研究领域:
材料科学
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化学传感
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环境监测
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Lu Tang,Kechen Zhou,Huiyu Su,Jiahong Tang,Qirui Wu,Lingfei Luo,Xiang Guo,Dawen Zeng
Detecting nitrogen dioxide (NO2) at room temperature (RT) is crucial for advancing environmental monitoring technologies, enabling efficient and practical air quality assessment. Two-dimensional (2D) MXene nanomaterials, recognized for their large specific surface area (SSA), abundant functional groups, and tunable electrical properties, have attracted considerable attention as promising candidates for room temperature gas-sensing applications. However, despite their potential, challenges, such as low gas adsorption efficiency, limited sensitivity, and poor selectivity, hinder their broader application and development, highlighting the need for further research. Here, we introduce a zero-dimensional (0D)/2D heterojunction gas-sensitive structure by synthesizing SnS2 quantum dot (QD)-sensitized Ti3C2Tx MXene nanocomposites via a hydrothermal method. The carefully designed gas sensor exhibits a significantly enhanced response value (RV) of 5.83% for 10 ppm of NO2 and a low detection limit of 500 ppb at RT, achieving an RV that is 5.8 times higher than that of pure Ti3C2Tx. Additionally, the sensor demonstrates high sensitivity (0.76 ppm–1 in the 0.5–5 ppm range), excellent selectivity, and outstanding stability, with a performance degradation of only 3.2% over 4 weeks. The exceptional performance arises from the synergistic effects of the quantum confinement properties of SnS2 QDs and the superior conductivity of Ti3C2Tx, which together provide abundant active sites for gas adsorption and facilitate efficient charge transfer pathways. Furthermore, the formation of the heterojunction modulates the resistance, enhancing room temperature sensing capabilities. The synthesized nanomaterials offer significant potential for advancing the design of heterostructures that integrate 0D QDs with 2D nanomaterials, paving the way for highly efficient NO2 detection at RT. Moreover, maintaining an optimal operating temperature further enhances the accuracy and reliability of real-time NO2 monitoring systems.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 13
·1940
·
IF 4.7
Kuo Zhao,Yunbo Shi,Mingrui Cui,Bolun Tang,Canda Zheng,Qinglong Chen,Yuhan Hu
High sensitivity and selectivity and short response and recovery times are important for practical conductive polymer gas sensors. However, poor stability, poor selectivity, and long response times significantly limit the applicability of single-phase conducting polymers, such as polypyrrole (PPy). In this study, PPy/MoS2composite films were prepared via chemical polymerization and mechanical blending, and flexible thin-film resistive NO2sensors consisting of copper heating, fluorene polyester insulating, and PPy/MoS2sensing layers with a silver fork finger electrode were fabricated on a flexible polyimide substrate using a flexible electronic printer. The PPy/MoS2composite films were characterized using X-ray diffraction, Fourier-transform infrared spectroscopy, and field-emission scanning electron microscopy. A home-built gas sensing test platform was built to determine the resistance changes in the composite thin-film sensor with temperature and gas concentration. The PPy/MoS2sensor exhibited better sensitivity, selectivity, and stability than a pure PPy sensor. Its response to 50 ppm NO2was 38% at 150 °C, i.e., 26% higher than that of the pure PPy sensor, and its selectivity and stability were also higher. The greater sensitivity was attributed to p–n heterojunction formation after MoS2doping and more gas adsorption sites. Thus, PPy/MoS2composite film sensors have good application prospects.
研究领域:
材料科学
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传感器技术
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 22
·11980-11989
·
IF 12.732
Zhuo Liu,He Lv,Ying Xie,Jue Wang,Jiahui Fan,Baihe Sun,Lin Jiang,Yang Zhang,Ruihong Wang,Keying Shi
Very diverse two-dimensional (2D) materials have bloomed in NO2 gas sensing applications, which provides new opportunities and challenges in function oriented gas sensors. In this work, a 2D/2D/2D structure of the Ti3C2Tx@TiO2@MoS2 composite was well designed via a facile one-step hydrothermal route, in which TiO2 nanosheets are in situ grown on ultrathin and highly conductive Ti3C2Tx MXene. Simultaneously, the few-layer and vertically oriented MoS2 nanoflakes rich in active edge-sites were uniformly distributed in the composite. Ti3C2Tx MXene and MoS2 act respectively as the electron reservoir and main sensitive material. The strong interfacial contact in different components facilitated the transfer of charge carriers and their spatial separation. Integrating the unique structural and electronic properties, the as-prepared Ti3C2Tx@TiO2@MoS2 sensor exhibited a remarkable gas sensing performance at room temperature (Ra/Rg = 55.16, 50 ppm NO2), which is 7.3, 3.8 and 2.1 times higher than that of pristine MoS2, TiO2@MoS2 and Ti3C2Tx@MoS2 composites, respectively. It also achieved ultrafast response time (1.8 s), more than 90% recoverability, low detection limit (23 ppb), dedicated selectivity and as long as eight-week stability.
研究领域:
材料科学
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传感器技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 1
·390-395
·
IF 2.936
Xianwei Fu,Shilong Jiao,Ning Dong,Gang Lian,Tianyu Zhao,Song Lv,Qilong Wang,Deliang Cui
A room-temperature NO2 gas sensor with excellent performances is fabricated using an MAPbI3 (MA = CH3NH3+) thin film. It presents a high response even under extremely low NO2 concentrations. Its average response and recovery times are only ∼5 s and ∼25 s at room temperature, respectively, exhibiting its quick-responsive character. In addition, the MAPbI3-based NO2 sensor exhibits good selectivity. Interestingly, the sensitivity of the MAPbI3-based NO2 sensor is strikingly improved under high-pressure gas conditions. This phenomenon can be used for the online monitoring of chemical reaction processes and in situ detection of trace-level gas impurities under high-pressure conditions. Furthermore, based on theoretical calculations, a simple model is proposed to illustrate the corresponding gas-sensing mechanism.
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
Nanomaterials
·
2023
·Vol. 13
·期 8
·1413
·
IF 5.3
Mingjia Bai,Chaoyang Li,Xiaojun Zhao,Qingji Wang,Qinhe Pan
ZnO is a wide band gap semiconductor metal oxide that not only has excellent electrical properties but also shows excellent gas-sensitive properties and is a promising material for the development of NO2sensors. However, the current ZnO-based gas sensors usually operate at high temperatures, which greatly increases the energy consumption of the sensors and is not conducive to practical applications. Therefore, there is a need to improve the gas sensitivity and practicality of ZnO-based gas sensors. In this study, three-dimensional sheet-flower ZnO was successfully synthesized at 60 °C by a simple water bath method and modulated by different malic acid concentrations. The phase formation, surface morphology, and elemental composition of the prepared samples were studied by various characterization techniques. The gas sensor based on sheet-flower ZnO has a high response value to NO2without any modification. The optimal operating temperature is 125 °C, and the response value to 1 ppm NO2is 125. At the same time, the sensor also has a lower detection limit (100 ppb), good selectivity, and good stability, showing excellent sensing performance. In the future, water bath-based methods are expected to prepare other metal oxide materials with unique structures.
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
危险品化学品经营许可证（带存储）