SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Jiyuan Xue,Bingcheng Shen,Juan Wang,Juan Li,Hongran Zhao,Tong Zhang
Nitrogen dioxide (NO 2 ), primarily emitted from transportation and industrial activities, poses significant threats to human health and environmental safety. However, reliable, repeatable, highly selective, and sensitive detection of NO 2 at room temperature remains challenging. In biological systems, metalloporphyrins are well known for their essential roles in gas transport, storage, and as catalytic centers in enzymatic redox reactions, demonstrating highly refined molecular recognition capabilities. Inspired by these unique gas-metal porphyrin interactions, we incorporated copper tetraphenylporphyrin (CuTPP) into a conductive polymer composite consisting of polyaniline (PANI) and Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) to construct a high-performance NO 2 sensor operating at room temperature. Upon exposure to NO 2 , Cu 2 ⁺ ions in CuTPP selectively adsorb NO 2 via a non-classical π-back bonding mechanism, which not only ensures high selectivity but also significantly facilitates charge transfer pathways centered around CuTPP, greatly enhancing electron extraction from PANI. For sensor recovery, ultraviolet (UV) was employed to promote the desorption of NO 2 . The developed sensor exhibits excellent linearity (R 2 > 0.97) within an NO 2 concentration range of 0.2–1 ppm, and achieves a theoretical detection limit of approximately 0.4 ppb, suitable for monitoring concentrations of NO 2 in environmental settings. By exploiting the non-classical π-back bonding interaction between CuTPP and NO 2 within a conductive polymer matrix, our approach provides a versatile and low-power strategy for precise NO 2 detection, with potential applications in environmental monitoring and assessment.
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高影响因子
Chemosensors
·
2025
·Vol. 13
·期 10
·368
·
IF 3.7
Ding Gu,Jun Dong,Wei Liu,Xiaogan Li
As industrial waste gas, nitrogen dioxide (NO2) is a serious hazard to air pollution and human health, and there is a pressing demand for developing high-performance NO2gas sensors. Tin disulfide (SnS2), a representative two-dimensional metal sulfide characterized by a significant specific surface area, a suitable electron band gap, and an easily tunable layered structure, shows a broad application prospect in gas sensing applications. Nevertheless, SnS2-based gas sensors suffer from poor sensitivity, which seriously hinders their application in room temperature gas sensing. In this study, Ag/SnS2heterojunction nanomaterials were synthesized by an in situ reduction approach. The findings reveals that the gas-sensitive response of the Ag/SnS2nanocomposites at room temperature under visible light irradiation can achieve 10.5 to 1 ppm NO2, with a detection limit as low as 200 ppb, which realizes the room-temperature detection of Sub-ppm NO2. Meanwhile, the sensor exhibits good selectivity, reproducibility (cyclic stability > 95%). The improved gas sensitivity of the Ag/SnS2sensor can be due to the synergistic effect of the carrier separation at the Ag/SnS2Schottky junction and the localized surface plasmon resonance (LSPR) of Ag nanoparticles. The LSPR effect significantly enhances light absorption and surface-active site density, facilitating trace NO2detection at room temperature. This study provides the foundation for the subsequent development of room temperature layered metal sulfide gas sensors.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Lin Chen,Xi Chen,Fei Wang,Yu Tong,Kewei Zhang,Zhengbo Han,Mingzhe Zhang
Metal-organic frameworks (MOFs) are regarded as potential candidate materials with great application prospects in the field of gas sensing. In this study, MOF derivatives were anchored onto MXene sheets through self-assembly technology to prepare a heterojunction material ZnO/Ti 3 C 2 T x MXene with high specific surface area, achieving ultrafast dual gas sensing behavior for H 2 /NO 2 . At a low temperature of 80°C, the ZnO/ Ti 3 C 2 T x MXene heterojunction sensor exhibited an ultrafast response (23.17%) to 500 ppb H 2 within 3.2 s. After a moderate temperature increase to 180°C, it also demonstrated significant sensing performance (46.3%) to 500 ppb NO 2 within 4 s. The electronic interaction mechanism of ZnO/ Ti 3 C 2 T x MXene heterostructures in H 2 and NO 2 detection was revealed through density functional theory calculations and in-situ Raman spectroscopy, clarifying the influence of interfacial charge transfer on sensing performance. Heterogeneous structures achieve the regulation of gas adsorption-induced electron rearrangement and carrier modulation by constructing interface charge-regulating channels, significantly enhancing the response rate, selectivity and reversibility in the detection of H 2 and NO 2 , thereby enabling highly sensitive and trace detection of the two gases.
研究领域:
材料科学
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气体传感技术
·
纳米材料
·
电子器件
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环境监测
·
能源安全
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Weiwei Meng,Ling Wang,Huizhu Zhou,Zhangxing He,Lei Dai
A novel amperometric NO 2 sensor was fabricated using a nanostructured La 0.8 Sr 0.2 MnO 3-δ (nano-LSM) sensing electrode (SE) and a Ce 0.8 Gd 0.2 O 1.9 (CGO) electrolyte. The focus of this study was to extend the electrochemical active site at the three-phase boundary (TPB) and reduce the interfacial resistance by introducing a hybrid ion/electron conducting porous layer (CGO +LSM) between the SE and the electrolyte. By adjusting the amount of LSM, the effects of the LSM/CGO ratio on the microstructure and sensitivity of the sensor were investigated. The results showed that the addition of LSM did not change the porous structure of the CGO porous skeleton, but the number of pores decreased with the increase of LSM addition, while the size of pores increased with increasing the amount of LSM added. The nano-LSM was prepared in-situ into the porous skeleton by the impregnation technology, which was highly dispersed in the porous skeleton, having reached the bottom of the porous layer with a particle size of less than 100 nm. The sensor with a mixed conductor as the porous layer effectively improved the sensitivity of the sensor. Analysis by electrochemical impedance spectroscopy (EIS) and the distribution of relaxation techniques (DRT) demonstrated that the addition of the electronic conductor LSM into the CGO porous layer significantly reduced the diffusion resistance of the sensor and enhanced the oxygen exchange performance, thus improving the response performance of the sensor. The sensor with 30wt% LSM/CGO porous layer had good reproducibility and excellent stability. The sensor had good anti-interference performance against co-existing CH 4 , CO 2 , H 2 , NO, and NH 3 , with good linearity between sensor response values and NO 2 concentrations over different O 2 concentrations and relative humidity (RH).
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 29
·14482-14490
·
IF 11.301
Xiao-Xue Wang,Hua-Yao Li,Xin Guo
Metal oxide based gas sensors should mostly work at high temperatures; the high working temperature is associated with safety concerns and high energy consumption, which makes portable and wearable devices almost impossible, and the inhomogeneous temperature distribution over a sensor also has a detrimental effect on the device performance. However, all the above problems can be effectively resolved by using visible light-excited sensors working at room temperature. By depositing an array of well-aligned In2O3 nanowires on polyimide (PI) substrates, we fabricate flexible and transparent sensors that achieve room temperature gas sensing using visible light as the excitation source. The detection limit to NO2 is as low as 10 ppb under illumination using both monochromatic (blue) and polychromatic (white) light sources. The sensing performance remains consistent after repetitive bending and long-term operation. Remarkably, the sensor exhibits recoverable response to 500 ppb NO2 even under the illumination of an iPhone screen with a low irradiance of 0.56 W m−2. Through a systematic study of the interaction between the photoelectric and gas sensing properties of the materials, we also explore the mechanism of photo-induced gas sensing reactions at room temperature. This work will lay the foundation for gas sensors that can be used in portable and wearable devices.
研究领域:
材料科学
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气体传感器
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光电子学
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纳米技术
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环境监测
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Journal of Physical Chemistry Letters
·
2026
·
IF 4.5
Xiangyu Zhang,Junting Qiu,Shinichi Enami,Xinming Wang
The heterogeneous chemistry of NOx in the atmosphere remains incompletely understood, and NOx potentially undergoes chemical reactions with organic peroxides (OPs) in the condensed phase. Here, we present a new experimental approach to directly quantify apparent rate constants (kapp) for reactions of Criegee-intermediate-derived OPs with NO2 and NO at the air–liquid interface. Using OPs derived from representative terpenoids (α-pinene,d-limonene, β-caryophyllene, and α-terpineol), we show that all OPs react extremely rapidly with NO2, while exhibiting much lower reactivity toward NO. The measured interfacial rate constants for OP + NO2 are approximately 3 orders of magnitude larger than those for OP + NO, consistent with preferential NO2 adsorption at the interface. At atmospherically relevant NO2 levels (1 ppb), OP lifetimes are reduced to the subsecond time scale, indicating that NO2 can dominate OP removal under elevated NOx conditions. These findings highlight the importance of interfacial NO2 chemistry in controlling the fate of Criegee-intermediate-derived OPs in the atmosphere.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yang Sun,Qiang Xie,Yangyang Zhu,Lu Wang,Qiang Sun,Lijuan Wang
In order to achieve high recovery for low concentration NO 2 gas detection, the α-6T OTFT gas sensors were fabricated by inducing growth method. The effect of interface inducing layer and active layer thickness on the sensor performance was studied. It was found that the p -6P inducing layer improved the surface properties of SiO 2 substrates and the α-6T films were manipulated to favorable film formation on p -6P interface layer. The α-6T crystal grains can be fused well and the large-area continuous crystal films were obtained. By the thickness modulation of α-6T active films, the sensors can achieve the detection to the low concentration of 1 ppm to NO 2 gas and exhibit the rapid recovery of 28 s. And the sensitivity was as high as 998% / ppm and the responsivity was up to 2645% for 1 ppm NO 2 gas. The formation of ultra-thin films on surface substrates is an effective method, which can induce the growth of organic semiconductor films and obtain the high-property devices.
研究领域:
材料科学
·
气体传感器
·
有机电子学
·
薄膜技术
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Nanomaterials
·
2023
·Vol. 13
·期 5
·917
·
IF 5.3
Donglin Li,Junfeng Lu,Xuanji Zhang,Dingfeng Jin,Hongxiao Jin
Nanoscale heterostructured zinc oxide/reduced graphene oxide (ZnO/rGO) materials with p–n heterojunctions exhibit excellent low temperature NO2gas sensing performance, but their doping ratio modulated sensing properties remain poorly understood. Herein, ZnO nanoparticles were loaded with 0.1~4% rGO by a facile hydrothermal method and evaluated as NO2gas chemiresistor. We have the following key findings. First, ZnO/rGO manifests doping ratio-dependent sensing type switching. Increasing the rGO concentration changes the type of ZnO/rGO conductivity from n-type (<0.6% rGO) to mixed n/p -type (0.6~1.4% rGO) and finally to p-type (>1.4% rGO). Second, interestingly, different sensing regions exhibit different sensing characteristics. In the n-type NO2gas sensing region, all the sensors exhibit the maximum gas response at the optimum working temperature. Among them, the sensor that shows the maximum gas response exhibits a minimum optimum working temperature. In the mixed n/p-type region, the material displays abnormal reversal from n- to p-type sensing transitions as a function of the doping ratio, NO2concentration and working temperature. In the p-type gas sensing region, the response decreases with increasing rGO ratio and working temperature. Third, we derive a conduction path model that shows how the sensing type switches in ZnO/rGO. We also find that p–n heterojunction ratio (np–n/nrGO) plays a key role in the optimal response condition. The model is supported by UV-vis experimental data. The approach presented in this work can be extended to other p–n heterostructures and the insights will benefit the design of more efficient chemiresistive gas sensors.Keywords:p–n junctions;ZnO;reduced graphene oxide;rGO;NO2sensing
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Nanomaterials
·
2022
·Vol. 12
·期 24
·4464
·
IF 5.719
Baohui Zhang,Chong Li,Min Li,Chen Fu,Ran Tao,Honglang Li,Jingting Luo
Nitrogen dioxide is one origin of air pollution from fossil fuels with the potential to cause great harm to human health in low concentrations. Therefore, low-cost, low-power-consumption sensors for low-concentration NO2detection are essential. Herein, heterojunction by SnO2quantum wires, a traditional metal oxide NO2sensing material, and Ti3C2TxMXene, a novel type of 2D layered material, was synthesized using a simple solvothermal method for enhancing gas-sensing performance and reducing operating temperature. The operating temperature was reduced to 80 °C, with a best performance of 27.8 and a fast response and recovery time (11 s and 23 s, respectively). The SnO2and Ti3C2TxMXene composite exhibits high speed and low detection limit due to the construction of the heterojunction with high conductive Ti3C2TxMXene. The selectivity and stability of gas sensors are carried out. This could enable the realization of fast response, high-sensitivity, and selective NO2sensing under low operating temperatures.Keywords:Ti3C2TxMXene;SnO2;gas sensor;NO2;nanocomposite
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Journal of Cleaner Production
·
2023
·
IF 11.1
Di Zhang,Hao Tang,Bing Zhao,Lijie Liu,Hongwei Pang,Xiangxue Wang,Shujun Yu
Radioactive uranium removal plays a key role in energy development and environmental security. Sulfide nanoscale zero-valent iron (S-NZVI) has good antioxidant capacity, dispersibility and activity to eliminate U(VI) from wastewater, but the removal efficiency is limited. To improve the reduction and adsorption capacity of S-NZVI, through treating Fe 3+ solution by nitro-functionalized UiO-66 (UiO-66-NO 2 ) with high porosity, UiO-66-NO 2 enhanced S-NZVI adsorbent (S-NZVI/UiO-66) was prepared by liquid phase reduction method. The smaller size and larger specific surface area of S-NZVI/UiO-66 were confirmed by a variety of characterization techniques. Based on the excellent surface structure and reactivity, the U(VI) removal capacity of S-NZVI/UiO-66 (895 mg g −1 ) was much better than S-NZVI (434 mg g −1 ) and UiO-66-NO 2 (267 mg g −1 ). The impacts of pH, background ion strength, coexisting ions and different water environments on adsorption were studied via macroscopic batch experiments. The results showed that S-NZVI/UiO-66 could remove U(VI) adequately in a wide pH range. The removal rate was basically not affected by the concentration of NaNO 3 , demonstrating that the adsorption process of U(VI) on S-NZVI/UiO-66 tended to inner surface complexation. From XPS technique combined with the results of batch adsorption experiments, it was clear that the elimination mechanisms of U(VI) by S-NZVI/UiO-66 were mainly the physical adsorption, electrostatic attraction and complexation of UiO-66-NO 2 , and the reduction and complexation of S-NZVI. Therefore, it is believed that S-NZVI/UiO-66 has a great potential to be an excellent adsorbent in the field of the environment remediation. Moreover, S-NZVI/UiO-66 promises to be a novel nanomaterial for solving the problem of radionuclide contamination in practical environments.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Linlin Qian,Canxiang Fang,Yanghai Gui,Kuan Tian,Huishi Guo,Dongjie Guo,Xiang Guo,Peng Liu
NO2 is a very dangerous and toxic gas and is prone to cause acid rain in high humidity environments, so it is essential to prepare a real-time monitoring and humidity immunity NO2 sensor. WO3 nanomaterials are commonly applied to detect NO2, but their poor immunity to humidity is still a critical limitation for the application. ZnO-nanorod-decorated WO3 nanosheets coated with ZIF-71 (ZnO@ZIF-71/WO3) composites prepared by an in situ growth method displayed excellent gas sensing performance and good humidity immunity to detect NO2. Compared to WO3 nanosheets and ZnO-nanorod-decorated WO3 nanosheets (ZnO/WO3) heterojunction composites grown on ceramic substrates in situ, ZnO@ZIF-71/WO3 presented excellent selectivity, good long-term stability, and a remarkably high response of about 947.96 to 100 ppm NO2 at 180 °C, which is 3.07 times higher than that of the ZnO/WO3 sensor and 4.59 times higher than that of the pure WO3 sensor. Even at a relative humidity of 85%, the response of ZnO@ZIF-71/WO3 to NO2 remained essentially constant. The functional ZIF-71 layer not only improved the humidity immunity of ZnO@ZIF-71/WO3 but also enhanced the sensitivity and selectivity performance to NO2 at low operating temperatures. The ZnO@ZIF-71/WO3 sensor still provided a response of 88.41 to 100 ppm NO2 at room temperature.
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Journal of Environmental Sciences
·
2022
·
IF 6.796
Lanxiadi Chen,Chao Peng,Jingchuan Chen,Jie Chen,Wenjun Gu,Xiaohong Jia,Zhijun Wu,Qiyuan Wang,Mingjin Tang
Mineral dust is an important type of ice nucleating particles in the troposphere; however, the effects of heterogeneous reactions on ice nucleation (IN) activities of mineral dust remain to be elucidated. A droplet-freezing apparatus (Guangzhou Institute of Geochemistry Ice Nucleation Apparatus, GIGINA) was developed in this work to measure IN activities of atmospheric particles in the immersion freezing mode, and its performance was validated by a series of experimental characterizations. This apparatus was then employed to measure IN activities of feldspar and Arizona Test Dust (ATD) particles before and after heterogeneous reaction with NO 2 (10±0.5 ppmv) at 40% relative humidity. The surface coverage of nitrate, θ (NO 3 − ), increased to 3.1±0.2 for feldspar after reaction with NO 2 for 6 hr, and meanwhile the active site density per unit surface area ( n s ) at -20°C was reduced from 92±5 to <1.0 cm −2 by about two orders of magnitude; however, no changes in nitrate content or IN activities were observed for further increase in reaction time (up to 24 hr). Both nitrate content and IN activities changed continuously with reaction time (up to 24 hr) for ATD particles; after reaction with NO 2 for 24 hr, θ (NO 3 − ) increased to 1.4±0.1 and n s at -20°C was reduced from 20±4 to 9.7±1.9 cm −2 by a factor of ∼2. Our work suggests that heterogeneous reaction with NO 2 , an abundant reactive nitrogen species in the troposphere, may significantly reduce IN activities of mineral dust in the immersion freezing mode.
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