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.
研究领域:
大气化学
·
环境科学
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MOLECULES
·
2023
·Vol. 28
·期 6
·2615
·
IF 4.6
Anqi Cheng,Jinru Zhao,Xi-Ao Wang,Zhen Lu,Yan Qi,Jiankun Sun
To exploit high-performance and stable sensing materials with a room working temperature is pivotal for portable and mobile sensor devices. However, the common sensors based on metal oxide semiconductors usually need a higher working temperature (usually above 300 °C) to achieve a good response toward gas detection. Currently, metal halide perovskites have begun to rise as a promising candidate for gas monitoring at room temperature but suffer phase instability. Herein, we construct 1D/3D PyPbI3/FA0.83Cs0.17PbI3(denoted by PyPbI3/FACs) bilayer perovskite by post-processing spin-coating Pyrrolidinium hydroiodide (PyI) salt on top of 3D FACs film. Benefitting from the 1D PyPbI3coating layer, the phase stability of 1D/3D PyPbI3/FACs significantly improves. Simultaneously, the gas sensor based on the 1D/3D PyPbI3/FACs bilayer perovskite presents a superior selectivity and sensitivity toward NO2detection at room temperature, with a low detection limit of 220 ppb. Exposed to a 50 ± 3% relative humidity (RH) level environment for a consecutive six days, the 1D/3D PyPbI3/FACs perovskite-based sensor toward 10 ppm NO2can still maintain a rapid response with a slight attenuation. Gas sensors based on hybrid 1D/3D-structured perovskite in this work may provide a new pathway for highly sensitive and stable gas sensors in room working temperature, accelerating its practical application and portable device.Keywords:gas sensor;NO2detection;1D/3D hybrid-structured perovskite;room temperature;stability
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高影响因子
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.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 38
·12999-13009
·
IF 6.4
Jinjuan Li,Jing Hu,Nan Li,Miao Cheng,Tao Wei,Qianqian Liu,Ruirui Wang,Wanfei Li,Yun Ling,Yafei Zhang,Bo Liu
Conventional metal oxide semiconductor gas sensors often suffer from high operating temperatures, low selectivity, and complex synthesis processes for NO2 detection. In this work, reduced graphene oxide (rGO) nanosheets are coated on NaOH-etched Cu2O/CuO urchin-like spheres to form Cu2O/CuO@rGO composites via a one-step green synthesis method at room temperature (RT). The gas sensor based on this material has been utilized for detecting NO2 at RT (25 °C), and the effects of Cu2O addition and reaction time on the morphology as well as gas-sensing properties of the as-prepared sensor are investigated. Of interest, the sensor based on the 550Cu2O/CuO@rGO-5 composite has an ultra-high response (S = 871) to 5 ppm NO2 gas at RT with a response/recovery time of 32/73 s, and the detection limit is as low as 90.6 ppt. In addition, the gas sensor shows excellent selectivity and repeatability. The excellent sensing performance of the as-prepared 550Cu2O/CuO@rGO sensor is attributed to the framework structure of Cu2O/CuO@rGO, the urchin-like hierarchical structure of the Cu2O/CuO and the synergistic effect of the p–p (Cu2O–CuO) heterojunction. This exploration of the present work offers a good reference for mass, green, and low-power sensing material preparation.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Yin Tang,Wen Cui,Songxia Wang,Fan Dong
Though photocatalytic purification of NO has been widely studied, how to avoid secondary pollution during gas-solid reaction is still a challenge, especially in inhibiting the formation of toxic intermediates (NO 2 ) and avoiding the blow away of powdery photocatalyst. Herein, we proposed a one-step solvothermal method to prepare melamine sponge (MS) supported and functionalized g-C 3 N 4 (CN), which simultaneously realizes the inhibition of NO 2 formation and catalyst loss. Sodium hydroxide , which plays a dual role, has been introduced during the preparation of supported photocatalyst. Specifically, sodium atom, as the modifier of performance, could facilitate the randomly distributed charge of pristine CN to be converged, which accelerates the adsorption/activation of reactants for efficient and deep NO oxidation . Hydroxyl group, as the binder between CN and MS, induces the interaction by forming hydrogen bonds , which contributes to the firm immobilization of powdery photocatalyst. The supported sample exhibits outstanding NO removal rate (58.90%) and extremely low NO 2 generation rate (1.41%), and the mass loss rate of photocatalyst before and after reaction is less than 1%. The promotion mechanism of performance also has been elaborated. This work takes environmental risks as a prerequisite to propose a feasible strategy for perfecting the practical application of photocatalytic technology .
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Qiumei Wang,Lihao Zhou,Shaobo Li,Xiao Chang,Xianghong Liu,Jun Zhang
The unique electronic and chemical properties of metal oxide heterostructures are critical to the development of room temperature (RT) sensors. In this work, we report the design of In 2 O 3 /SnO 2 heterostructures based on atomic layer deposition (ALD), which regulates the energy band structure of the material and promotes the electron transfer, thus enhancing the adsorption of target gases. The sensor based on In 2 O 3 /SnO 2 demonstrates outstanding sensing performance at RT with an extreme response of 2900 to 10 ppm NO 2 , which to our knowledge outperforms the reported metal oxide sensors, as well as a detection limit of 61 ppb. Density functional theory (DFT) calculations show that the charge transfer (0.494 e) and interaction energy (2.19 eV) between In 2 O 3 /SnO 2 and NO 2 are significantly enhanced. This work highlights the critical function of heterostructured materials in enhancing the sensing capabilities of semiconductors, providing some hints for the design of ultrasensitive NO 2 sensors.
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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.
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CHEMICAL PHYSICS
·
2021
·
IF 2.348
Xingchang Tang,Yongwei Luo,Zhijian Zhang,Wanwu Ding,Dexue Liu,Jingchuan Wang,Li Guo,Ming Wen
The high surface areas and tunable properties of Zr-based MOFs make them as attractive materials for gas capture, storage, and separation. In this work, UiO-66, one kinds of Zr-based MOFs, functionalized by single or binary –NO 2 and –NH 2 groups are synthesized. Water adsorption ability and hydrophilicity of UiO-66 and functionalized UiO-66-X were investigated. It is found that surface area of UiO-66 is decreased after introducing functional groups, while hydrophilicity of UiO-66 increased after functionalized with –NO 2 and –NH 2 . Therefore, after balance the effects of surface area and hydrophilicity, UiO-66-NH 2 shows the best water adsorption propriety.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 10
·7834-7849
·
IF 3.442
Dong Xuejun,Wu Keliang,Zhu Weifang,Wu Pengcheng,Hou Juan,Wang Zhaoxiong,Li Ran,Wu Jianning,Liu Zhiyong,Guo Xuhong
As a strong oxidizing pollutant, NO 2 can cause fire or even explosion. People living in atmosphere containing NO 2 for a long time will significantly affects human health. In this work, we developed a Schottky heterojunction sensor modified by g-C 3 N 4 quantum dots (g-C 3 N 4 QDs) and rGO deposited on TiO 2 nanotubes (TNTs) arrays. This sensor showed high response and extremely fast response/recovery time as well as excellent detection of ppb level of NO 2 at room temperature. TNTs were obtained using a one-step anodic oxidation process. TNTs were modified with g-C 3 N 4 QDs and rGO using quasi -CVD method and cyclic voltammetry during in situ electrodeposition, respectively. TNTs/g-C 3 N 4 QDs/rGO Schottky heterojunction sensor exhibited high sensitivity to 10 ppm of NO 2 (response equal to 15982) at room temperature. Below 15 ppb, sensing response also can reach 127. Sensor response was very fast and increased to 15982 in just 2 s when exposed to 10 ppm of NO 2 after which it recovers 90% within 1.16 s. This work clarified the influence of abundant oxygen vacancies (VO · ) in TNTs and photogenerated electrons on TNTs/g-C 3 N 4 QDs/rGO nanostructures as well as their sensing performances. Our experimental details demonstrated that Schottky barrier was established between TNTs and rGO, which was very beneficial for ppb-level NO 2 detection at room temperature.
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MATERIALS CHEMISTRY AND PHYSICS
·
2016
·
IF 2.101
Kexin Li,Shufen Liu,Shaoting Yi,Liushui Yan,Huiqin Guo,Yuhua Dai,Xubiao Luo,Shenglian Luo
Nitryl surface functionalized TiO 2 hollow spheres (TiO 2 -NO 2 HSs) composite material was successfully fabricated by a simple sol-gel combined with solvothermal and concentrated HNO 3 treatment strategy using carbon microspheres obtained from hydrothermal carbonization of waste Camellia oleifera shells as a template. The microstructure, surface property, compositional and structural information, and optical and electronic property of as-prepared TiO 2 -NO 2 HSs were well characterized. Compare with conventional g-C 3 N 4 and TiO 2 photocatalysts , the as-prepared TiO 2 -NO 2 HSs exhibited excellent simulated sunlight photocatalytic activity toward aqueous organic pollutants degradation and hydrogen evolution from water-splitting, which can be attributed to their unique hollow spherical microstructure and the introduction of -NO 2 groups.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Ping Li,Ying Yang,Feng Li,Wenyuan Pei,Dan Li,Hui Yu,Xiangting Dong,Tianqi Wang
High sensitivity and rapid response are important for environment monitoring of gas sensors. Herein, we introduced polyoxometalates (POMs) as electron acceptors into a low-resistance sulfide gas sensitive material, ZnS, for the first time, and prepared a group of heater-type gas sensors by using ZnS/PW 12 composite microspheres. The sensor performances to NO 2 gas were comprehensively explored. The optimized ZnS/1 %PW 12 composite sensor exhibited an ultrahigh response of 358.1 to 50 ppm NO 2 gas, which is 4.86 times greater than that of pure ZnS sensor, and higher than performances of most reported ZnS-based NO 2 sensors in literatures. Simultaneously, the ZnS/1 %PW 12 composite sensor also exhibited accelerated response and recovery time of only 82 and 30 s, respectively, much faster than pure ZnS sensor (147 and 72 s). The reason for the improvement of the sensing performance was explored via mechanism study, and it was found that the introduction of PW 12 into ZnS sensor contributed to its enhanced performance. PW 12 , as an electron acceptor, increased carrier mobility and reduced electron-hole recombination, and thus enhanced gas sensing properties. Moreover, other gas sensing parameters such as selectivity, repeatability, long-term stability were investigated. Hence, this study contributed to the literature on the development of polyoxometalates-based gas sensors.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xinmiao Nie,Xue Zhong,Fan Yang,Rongguo Wang,Xiaodong He,Wenbo Liu
Real-time detection of harmful gases at room temperature has become a serious problem in public health and environmental monitoring. Two-dimensional materials with semiconductor properties BiOCl is a promising gas-sensitive material due to its large specific surface area and adjustable band gap as well as outstanding safety characteristics. However, limited by the weak gas adsorption sites and sluggish charge-transfer ability, the performance of BiOCl could not be fully exploited. Oxygen vacancy (Vo) engineering can introduce lattice defects, thereby significantly increasing the local charge density and enhancing the adsorption of gases, which is an effective strategy to enhance the gas-sensing performance. In this work, we composite BiOCl with a vacancy (Vo-BiOCl) and reduced graphene oxide (rGO) to construct a Vo-BiOCl/rGO heterostructure with enhanced gas adsorption sites. Experimental and theoretical calculations show that Vo can enhance the adsorption of gases and the introduction of rGO forms a high-quality heterostructure with BiOCl, which can effectively reduce the band gap of BiOCl and promote electron transfer, thereby improving the sensitivity of the sensor. Benefiting from above, Vo-BiOCl/rGO achieves the ability to detect low concentrations of NO2/NH3 at room temperature, with high sensitivity (55% at 1 ppm of NO2 and −28% at 1 ppm of NH3), fast response time (40 s at 1 ppm of NO2 and 2 s at 1 ppm of NH3), good stability (over 150 days), and fully recoverable gas sensitivity.
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高影响因子
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