ACS Sensors
·
2025
·
IF 9.1
Wenbin Ren,Jinfeng Luan,Liang Yin,Huijuan Chen,Changchun Wang,Pinhua Zhang,Guangliang Cui,Li Lv
The development of real-time trace-level NO2 quantification platforms that can be operated at room temperature constitutes a critical advancement for occupational safety and public health monitoring systems. This study demonstrates a room-temperature NO2 sensor using MXene–Cu2O composites prepared via a hydrothermal method. Systematic evaluation of MXene-introduced effects identified the 0.84 wt % MXene–Cu2O composite as optimal, exhibiting 4-fold enhanced sensitivity and shorter response (55 s)/recovery (35 s) time compared to pure Cu2O. Additionally, the sensor exhibits a low detection limit (10 ppb), high selectivity, great reversibility, and long-term stability. The enhanced sensing performance originates from precisely engineered interfacial architectures between MXene and Cu2O, which effectively adjust the charge-transfer behavior through the conduction tunnel in the sensing material. Furthermore, oxygen vacancy engineering creates defect-mediated adsorption centers that promote selective NO2 chemisorption through charge polarization effects. This research offers a novel strategy for designing optimized structures to enhance the sensitivity of MOS-based materials for NO2 gas detection.
研究领域:
材料科学
·
环境监测
·
化学传感器
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Weimeng Zheng,Zhongyue Zhang,Nannan Liu,Qingyu Li,Jianbo Sun
The construction of heterogeneous structures could boost the performance of materials in gas sensing applications since the interface may enhance charge transfer. However, appropriate design and containable synthesis methods of heterogeneous structures with high-quality interfaces remain challenging. In this paper, heterolayered SnO2/SnSe nanosheet composites were prepared by regulating the alkali concentration to control the self-assembly rates of SnSe nanosheets while forming defect point oxidation. Heterolayered SnO2/SnSe nanosheets were synthesized by a one-step hydrothermal method and then used as a highly sensitive sensor for the detection of NO2 at room temperature. The as-obtained SnO2/SnSe materials were characterized using scanning electron microscopy, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and I–V polarization to analyze the relationships between the heterogeneous structural morphology, crystallography, chemical components, electrical properties, and sensitivity mechanism. The results showed that the SnO2/SnSe-0.4 sample was prepared by the one-step hydrothermal method at the NaOH concentration of 0.04 mol/L. The SnO2/SnSe-0.4 sensor showed great sensitivity and higher selectivity to 1 ppm NO2 (resistance ratio = 7.8) at room temperature, roughly 7.1 and 2.7 times higher than that of pure SnSe and SnO2, respectively. In addition, the sensor exhibited a lower detection limit of 0.1 ppm. The improved sensing performance could be attributed to the large number of P–N heterojunctions of the SnO2/SnSe-0.4 material, enhanced interface charge transfer, and increased defect point oxidation in the material surface. The experimental results showed that SnO2/SnSe-0.4 is a very promising room-temperature NO2 gas sensing material, providing guidance for the rational design of heterogeneous structural sensors.
研究领域:
材料科学
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传感器技术
·
纳米材料
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Di Liu,Zilong Tang,Zhongtai Zhang
SnS 2 is a promising candidate for NO 2 sensing applications due to its suitable band gap and large electronegativity. However, SnS 2 based gas sensors are still restricted to detect NO 2 gas at room temperature due to their giant resistance and poor recovery. Here, we report hollow SnO 2 @SnS 2 nanostructures prepared by a one-step hydrothermal method. The SnO 2 @SnS 2 based sensor showed high response and good recovery to ppb-level NO 2 under visible illumination at room temperature (25 °C). The superior sensing performance of the SnO 2 @SnS 2 sensor was attributed to the hollow porous heterojunction structure beneficial for gas diffusion, as well as visible light assistant facilitating charge transfer and gas desorption. This work systematically studied the influence of oxygen concentration in background gas on the NO 2 sensing performance of the SnO 2 @SnS 2 sensor, and proposed a physical adsorption model for the NO 2 sensing mechanism of the SnO 2 @SnS 2 sensor under visible light at room temperature. In addition, the effect of humidity on the gas sensing performance of the SnO 2 @SnS 2 sensor to different concentrations of NO 2 was also discussed.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Chao Zhang,Ying Li,Guifang Liu,Kewei Liu,Kaidi Wu
NO 2 emission is currently one of the important factors threatening the quality of life of residents. Preparing ZnO-based gas sensors to monitor the concentration of NO 2 has attracted growing attention. This article reports a method for preparing ZnO 1-α by hydrogen heat treatment. The ZnO coating prepared by the spin coating method is directly placed in a reduced atmosphere with 3% hydrogen for heat treatment to produce a self-doped ZnO 1-α coating with oxygen vacancies , which can effectively narrow the bandgap. The article studied the influence of heat treatment time and visible light wavelength on sensing properties. The results show that under the conditions of room temperature and blue light irradiation, the coating heat-treated in a reduced atmosphere for 1 h showed the best gas-sensing properties to 1 ppm NO 2 with a response of 7.0. The outstanding selectivity of ZnO 1-α coating has been displayed.
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
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Lu Wang,Lijuan Wang,Ziyang Cui,Yiqun Zhang
In order to achieve high sensitivity in gas-sensors based on organic field-effect transistors (OFETs), the most crucial and direct approach to enhance their sensing performance and reduce response and recovery times was through appropriate modification or improvement of the organic semiconductor (OSCs) layer, such as altering its surface morphology or structure. The micro/nano structure of spin-coated copper phthalocyanine (CuPc) films was controlled by utilizing polyvinyl alcohol ordered nanofibers (PVA ONFs). The electrical and gas-sensitive properties of CuPc/PVA ONFs films were investigated and analyzed. The CuPc/PVA ONFs film transistors exhibited improved output and transfer characteristics when the CuPc solution concentration was 75 mg/mL, with a mobility (μ) of 6.90 × 10-4 cm2/Vs. Compared with the spin-coated CuPc film transistors, the mobility increased by 74.24%. The sensors demonstrated the relative response of 12,942 % to 20 ppm NO2 gas. Additionally, it showed the response time of 1.49 min and recovery time of 2.32 min. The response rate reached up to 90 %, while the sensitivity was measured at 611 %/ppm, and the limit of detection (LOD) stood at 0.2 ppm. The research presented in this paper advances the potential applications of phthalocyanine materials within the realm of flexible and 3D-printed sensing technologies.
研究领域:
材料科学
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传感器技术
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Hang Liu,Junlong Liu,Yanchang Liu,Zhihao Qu,Siye Tian,Yuhong Zhang
In this work, the ZnO microsphere is prepared by hydrothermal method and modified with different concentrations of Eu. The morphology of ZnO:Eu sample shows flower-like microspheres with many nanosheets. The gas performance of ZnO:Eu microsphere is investigated for detecting NO 2 . Compared with pure ZnO, the response of ZnO:2 % Eu sensor is increased by 8 times, and the optimal operating temperature of that is decreased to 130 °C. Especially, the gas sensing properties of ZnO:2 % Eu sensor is enhanced under UV excitation. The recovery time of ZnO:Eu sensor is reduced by 1200 s, and the response is increased by 3.6 times under UV excitation. The above results show an increase in sensor response due to doping Eu and UV excitation. At last, the possible gas mechanism of ZnO:Eu is discussed with and without UV excitation. This finding provides important guidance for UV-assisted sensors to enhance NO 2 response.
研究领域:
材料科学
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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
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
·
2024
·
IF 5.3
Jiyun Gao,Youyou Yin,Yongjing Guo,Lijuan Jia,Futing Xia,Chenhui Liu,Ming Hou,Fang Wang
NO 2 is a toxic gas that poses a significant threat to the environment and human health. In this work, one-dimensional ZnO nanowires and two-dimensional layered titanium carbide (Ti 3 C 2 T x ) have been prepared by hydrothermal and selective chemical etching methods, respectively. The Ti 3 C 2 T x /ZnO composites are synthesized by electrostatic self-assembly method. The characterization results indicate that the ZnO nanowires are uniformly dispersed on the surface of layered Ti 3 C 2 T x to form a heterostructure. Meanwhile, the gas sensitive performance of Ti 3 C 2 T x /ZnO composite material is investigated and compared with that of pure Ti 3 C 2 T x . The results reveal that the composite exhibits a high selectivity as well as sensitivity with a response value (S = Rg/Ra) of 18.66 to 100 ppm NO 2 at 250 ℃, which is 4.3 times higher than that of pure Ti 3 C 2 T x . This proves that the prepared composite material is an effective sensing material for detecting NO 2 gas.
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
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 7
·077514
·
IF 3.1
Tengteng Zhao,Chaoyu Wang,Lei Dai,Weiwei Meng,Yongguang Liu,Yuehua Li,Ling Wang
NO2 is an important pollutant of automobile engines and industrial fuels, making it important to quantitatively monitor and control. An amperometric-type NO2 gas sensor was fabricated using yttria-stabilized zirconia (YSZ) electrolyte with a bi-layered structure and La0.7Sr0.3MnO3−δ-xNiO (LSMO-xNiO, x = 0–0.75) composite sensing electrode (SE) prepared by impregnation method in combination with self-demixing. The samples were characterized using SEM, XRD, and XPS, and their performance as sensors was tested. LSMO-xNiO composite SE particles were formed by de-mixing in the process of treating the precursor at high temperatures and are uniformly dispersed in the YSZ porous backbone. With the increase of NiO content, the SE particles become significantly large. At 450 °C–600 °C, the response currents at a fixed potential have a linear relationship with the NO2 concentrations at 25–700 ppm. Combining stability and sensitivity, the voltage was fixed to −0.25 V. The introduction of NiO into the LSMO sensing electrode effectively improves the performance of the sensor. The sensor based on LSMO-0.5NiO has the highest sensitivity (0.0405 μA/ppm) at 550 °C. Simultaneously, the sensor exhibits good anti-interference ability for CH4, CO2, O2, and NO, but has obvious cross-sensitivity to H2 and NH3. In addition, the response current of the sensor change with the increase of RH.
研究领域:
材料科学
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环境监测
·
传感器技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Haixia Xing,Xinlei Li,Shupeng Sun,Baoyu Huang,Xiaogan Li
The γ-In 2 Se 3 /In 2 O 3 nanoflower-like heterojunctions were synthesized by solvothermal treatment followed by thermal oxidation in Air. The nanoflower-like γ-In 2 Se 3 /In 2 O 3 -based chemiresistive-type sensor showed a significantly enhanced response to NO 2 at an operating temperature of 170°C. The sensor achieves a response of 2.69–0.2 ppm NO 2 at 170°C. The sensor exhibits remarkable selectivity to several possible interferents such as carbon monoxide , ammonia, formaldehyde, acetone, methanol, and toluene, and good stability at 170°C. The nanoflower structure increases the specific surface area and introduces more active sites, which improves the sensitivity of the sensor to NO 2 . The heterojunction formed between γ-In 2 Se 3 and In 2 O 3 improves the charge carrier transfer between NO 2 gas molecules and sensing materials, thereby increasing the response of the sensor to NO 2 . Density functional theory was used to elucidate this sensing mechanism, and it was found that improved sensing performance is mainly due to heterojunction formation , which increases the adsorption energy of nitrogen dioxide molecules on a sensing material surface and facilitates charge transfer between molecules.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 23
·5006-5015
·
IF 6.569
Ruozhen Wu,Juanyuan Hao,Tingting Wang,Shengliang Zheng,You Wang
The two-dimensional layered metal dichalcogenides (LMDs) SnS2 is an interesting candidate for high-performance NO2 gas sensors. However, most SnS2-based NO2 sensors are usually inert for detecting ppb-level NO2 at room temperature (RT) because of the intrinsic features of a large bandgap, poor conductivity, and lack of active sites. Herein, we successfully endowed SnS2 with ppb-level NO2 detection at RT by using a carbon (C)-doping strategy. Compared to the pristine SnS2 showing a negligible response toward NO2 at RT, the C-doped SnS2 exhibited an excellent response (481.3% for 1 ppm and 146.5% for 100 ppb) with full recovery. The sensitivity toward ppb-level NO2 was as high as 1200% ppm−1. Moreover, the experimental and theoretical limit of detection (LOD) were down to 10 ppb and 0.3 ppb, respectively. Such impressive gas-sensing performance of C-doped SnS2 at RT was due to the doping-mediated synergistic effect of energy-band modification and the presence of an S vacancy. The results provide a real solution for developing high-performance LMDs-based gas sensors.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Liwei Zhang,Feng Li,Ying Yang,Dan Li,Hui Yu,Xiangting Dong,Tianqi Wang
WO 3 is a representative metal oxide semiconductor gas sensing material with good selectivity and high sensitivity. However, high electron-hole recombination is a common drawback of WO 3 -based gas sensors. Here, we used silicotungstic acid (SiW 12 ), a classical Keggin-type polyoxometalate (POM) as precursor. After oxidation, WO 3 with cubic/orthorhombic mixed-phase were in-situ formed. Gas sensing performances of the WO 3 to ppb-level NO 2 gas were tested to explore whether the POM-derived WO 3 has advantage for gas sensor applications. Surprisingly, the c/o-WO 3 calcined at 800 °C exhibit a response value of 5.239 to 500 ppb NO 2 with very high selectivity, good long-term stability, repeatability and humidity resistance. By mechanism analysis, the bandgap positions of o-WO 3 and c-WO 3 are staggered, forming an internal electric field that favours electron-hole separation and improves the gas sensing performance. This work transforms POMs into two-phase mixed WO 3 , providing a new idea for the application of POMs as precursors in gas sensors.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
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