Chemosensors
·
2023
·Vol. 11
·期 5
·289
·
IF 4.2
Ji Zhang,Fangfang Zhang,Xu Li,Qingji Wang
With increasingly serious environmental problems caused by the improvement in people’s living standards, the number of cars has increased sharply in recent years, which directly leads to the continuous increase in the concentration of NO2in the air. NO2is a common toxic and irritant gas, which is harmful to both the human body and the environment. Therefore, this research focuses on NO2detection and is committed to developing high-performance, low detection limit NO2sensors. In this study, flower-like Au-loaded In2O3was successfully fabricated using the hydrothermal method and the wet impregnation method. The morphological features and chemical compositions of the as-prepared samples were characterized using SEM, TEM, XRD and XPS. A variety of sensors were fabricated and the gas-sensing properties of sensors were investigated. The results indicate that the sensor based on 0.5 mol% Au/In2O3shows a response value of 1624 to 1 ppm NO2at 100 °C, which is 14 times that based on pure In2O3. Meanwhile, the detection limit of the sensor based on 0.5 mol% Au/In2O3for NO2is 10 ppb, and the response value is 10.4. In addition, the sensor based on 0.5 mol% Au/In2O3also has high selectivity to NO2among CO, CO2, H2, CH4, NH3, SO2and H2S. Finally, the sensitization mechanism of Au/In2O3was discussed, and the reasons for improving the performance of the sensor were analyzed. The above results and analysis demonstrate that the gas-sensing attributes of the sensor based on 0.5 mol% Au/In2O3to NO2improved remarkably; at the same time, it has been proved that the composite material has extensive potential in practical applications.Keywords:NO2sensor;flower-like;Au-loaded In2O3;low detection limit;high selectivity
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Bo Wang,Xinxin Gao,Junming He,Yanan Xiao,Yong Liu,Xiaoteng Jia,Kan Zhang,Chenguang Wang,Peng Sun,Fangmeng Liu,Geyu Lu
Achieving ppb-level nitrogen dioxide (NO 2 ) detection is of great significance in environmental monitoring and human daily life. The construction of portable and high-performance NO 2 sensor working at room temperature is the focus of attention. In this work, three-dimensional Mo 2 CT x nano-crumpled spheres (MS) sensitive material was designed and prepared via ultrasonic spray pyrolysis method, and a room-temperature planar type MS-based NO 2 sensor was successfully developed using drop-casting onto PI substrate with Au interdigital electrode. The sensor utilizing MS sensitive material exhibits the highest response value (−23.53%) to 5 ppm NO 2 and a lowest detection limit of 30 ppb at room temperature, also the excellent selectivity. Characterization and density functional theory calculation prove that the excellent NO 2 sensing properties are attributed to the increased specific surface area and more exposed edge-rich active sites which are caused by small size three-dimensional nano-crumpled spheres structure. This study provides a new strategy for improving the sensing performance of MXenes-based gas sensor and a new method for the construction of room temperature ppb-level NO 2 sensor.
研究领域:
材料科学
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Xinlei Li,Zhaoyi Zhang,Shupeng Sun,Nan Wang,Baoyu Huang,Xiaogan Li
Hierarchically structured In 2 S 3 @In 2 O 3 nanorods were synthesized via a two-step hydrothermal method. Compared to single-component In 2 O 3 based sensors, the as-developed In 2 S 3 @In 2 O 3 nanorods based chemiresistive-type sensor exhibited significantly enhanced response and reduced operating temperature. The sensor displayed a response of approximately 51.2 to 3 ppm NO 2 at 120℃, with a response time and recovery time of 76 and 48 seconds, respectively, and a detection limit of NO 2 concentration to 0.014 ppm. By constructing In 2 S 3 @In 2 O 3 heterojunctions, the optimal operating temperature has been effectively lowered from 160℃ to 120℃. The improved sensing performance is attributable to the nano-heterojunctions formed between In 2 S 3 and In 2 O 3 , which increase the specific surface area to provide additional active adsorption sites, and as well, prevent the shielding effect of surface-adsorbed oxygen on NO 2 . Density functional theory (DFT) calculations demonstrated that the introduction of heterojunctions of In 2 S 3 @In 2 O 3 enhances the adsorption energy and charge transfer between NO 2 and the sensing material.
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
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Xiangdong Cao,Junsheng Hong,Zhonglei Zhang,Junda Li,Jihua Tang,Jiaqi Wang,Duo Yi,Xuejin Li,Yu Du,Xiaoqing Tian
Flower-like zinc oxide nanoclusters were successfully incorporated by different amount of PTCDA organic dye molecular, forming the hetero-structured PTCDA/ZnO composites. Remarkably, a study performed on their NO 2 sensing properties reveals that the 0.5 wt% PTCDA-loaded ZnO sensor exhibits high response, excellent selectivity, quick response speed and low detection limit of 7.4 ppb towards NO 2 molecules at room temperature (25 °C) under green light illumination, which possesses an apparent advantage over the ZnO sensors loaded with other PTCDA concentration as well as upon other light illumination conditions . This work makes a meaningful contribution to the development of NO 2 sensor based on wide-band gap semiconductors with visible light irradiation .
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Liwei Zhang,Tianqi Wang,Ying Yang,Meijie Wei,Feng Li,Hui Yu,Xiangting Dong
MoS 2 is a promising gas sensing material due to its low resistance and low operating temperature. But the sensitivity of MoS 2 is limited by fast electron-hole complexation. In this work, phosphomolybdic acid (PMo 12 ) was used as precursor. After sulfurizing by one-step hydrothermal method , the generated MoS 2 and unspent PMo 12 can in-situ form MoS 2 /PMo 12 composite nanospheres . The gas sensing performances of the composite were comprehensively investigated. By adjusting hydrothermal reaction temperature, optimized sensitivity (MoS 2 /PMo 12 -240) to NO 2 gas can be gained. At a low operating temperature of 80 °C, the optimized response value to 100 ppm NO 2 gas is 2.466, which is higher than most reported MoS 2 -based NO 2 sensors. Moreover, MoS 2 /PMo 12 -240 composite also exhibits good selectivity, repeatability, long-term stability and humidity resistance. The mechanism of sensing performance enhancement was also analyzed and discussed. As a semiconductor-like material, PMo 12 can form heterojunction together with MoS 2 . The valence band of PMo 12 can capture the holes in MoS 2 and effectively suppresses electron-hole complexation. Thus the sensing performance can be improved. This work provides a new strategy for designing and constructing high performance sulfide composite gas sensors by introducing POMs .
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jing Hu,Chenming Yin,Miao Cheng,Tao Wei,Qianqian Liu,Wanfei Li,Yun Ling,Yafei Zhang,Bo Liu
Constructing heterostructure and N-doping are two effective methods to improve gas sensing performance. Herein, a facile novel solution calcination strategy has been proposed to synthesize N-doped carbon sheets-zinc oxide (NC-ZnO) hybrids for low concentration NO 2 detection. The formation of NC is accompanied by generation of ZnO particles on its surface to construct heterostructure. Intriguingly, NO 3 - acts as an expanding agent and N source in the calcination process, wherein the N elements are directly doped into carbon sheets. As expected, the prepared heterostructural NC-ZnO-63 hybrids exhibit 74.9 times enhancement of response as well as high sensitivity (~ 265.8–20 ppm NO 2 ), excellent repeatability and selectivity compared with pure ZnO. Importantly, the measured detection limit of the NC-ZnO-63 sensor to NO 2 is about 100 ppb (~ 0.3) and the calculated detection limit is 2.65 ppb. Furthermore, the influences of humidity on testing NO 2 gas have been researched systematically which would provide guidance for practical use of similar sensors. In this work, ZnO and derived carbon are low-cost, eco-friendly, and the synthesis strategy presented here is simple and repeatable, which provides new idea for mass fabricating other-type metal oxides-NC hybrids for various applications.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
SuSu Liu,Zheng Lian,Mingjia Zhang,Shule Zhang,Qin Zhong
A novel strategy was proposed to scrub NO x pollutant originated from sintering flue gases by oxidation combined with wet flue gas denitrification technology. CuCl 2 that could be adopted repeatedly was introduced as an additive into the sulfite solution to enhance NO 2 removal. Comparing with the sulfite solution (0.05 mol/L), the absorption efficiency improved from 75% to 100%, and the stabilization period extended from 10 to 40 min notably with the addition of CuCl 2 . The intensification by CuCl 2 addition was related to the formation of CuCl during the reaction of CuCl 2 and SO 3 2− , which was found to be more effective in removing NO 2 . Afterwards, CuCl transformed to Cu 2+ substance again and this mutual transformation between CuCl and Cu 2+ substance indicated a cyclic use of CuCl 2 additive. Moreover, the feasible reaction pathway was further proved by DFT calculations. Additionally, the investigation on NO 2 absorption at various operating parameters provided theoretical support for the practical application of CuCl 2 in denitrification.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Chengjiu Zhao,Xuezheng Guo,Yanqiao Ding,Chengyao Liang,Bingsheng Du,Wen Niu,Weijie Qu,Yijie Shi,Shuren Cong,Gang Meng,Yong He
Complex gas environments and the demand for room temperature detection will provide challenges for chemo-resistive-type gas sensors in a variety of applications. In this work, 2D/0D SnSe 2 /TiO 2 composite is used as a sensing material, displaying good sensitivity and specificity to ppb-level NO 2 at ambient temperature (25 °C). The response value and time of the SnSe 2 /TiO 2 sensor are 207 % and 139s when exposed to 100 ppb NO 2 , as opposed to 62 % and 183s for the pristine SnSe 2 sensor. The composite sensor also offers great long-term stability for NO 2 and good gas selectivity. Notably, the SnSe 2 /TiO 2 sensor's mixed gases (NO 2 +H 2 S) measurement is done to examine its NO 2 detection capacity in the presence of interfering gas. The constructed composite sensor can accurately detect NO 2 even if the concentration of the reductive interfering H 2 S is 66.7 times higher than that of the oxidative target NO 2 . The effective usage of SnSe 2 modified by TiO 2 for low-concentration, room-temperature NO 2 detection in a complex gas environment is shown by the composite sensor's pleasing gas detection results.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Wen-Tao Li,Xiao-Dong Zhang,Xin Guo
Ni-doped SnO 2 nanofiber array was prepared from a modified electrospinning technique followed with hot-press and calcination, which impart the nanofiber with high crystallinity as well as good adhesion to the substrate. The nanofiber array consists of well-aligned straight fibers with an average diameter of ∼200 nm and length of several millimeters. Each fiber consists of rutile-structured polycrystals with an average grain size of ∼5 nm. Conductometric gas sensors were developed from the nanofiber array using magnetron sputtering. These sensors show excellent performance for NO 2 detection at 250 °C, including high response (90.3 under 20 ppm), fast response and recovery (40 s/18 s), and above all, excellent selectivity. Beneficial for electron transport, the nanofiber array offers better device performance over random nanofibers on sensing response and time for recovery. In addition, the NO 2 sensing mechanism was probed with detailed DRIFT and XPS analysis.
研究领域:
材料科学
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环境科学
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传感器技术
✓ 已验证
DOI
高影响因子
Advanced Materials Technologies
·
2020
·Vol. 6
·期 1
·2000566
·
IF 5.969
Jinyong Wang,Jun Zhang,Wenfeng Wang,Yanan Guo
The detection of ultralow NO 2 for practical applications remains a significant challenge because the two critical characteristics of high sensitivity and good robustness are considerably unsatisfactory. Inspired by the classification of stimuli-receiving and signal-conveying for a stimuli-responsive procedure of a neuron in organisms, an internal micro-Schottky junction introduced into a chemiresistor is constructed as an efficient transduction strategy to boost the less concerned transducing stage for a further improvement in NO 2 sensing performance. The SnO 2 nanoflowers/reduced graphene oxide-based chemiresistor achieves a response of 10.5 toward 10 ppt NO 2 , with a record-breaking limit of detection of 0.73 ppt at room temperature as well as fast response and recovery times of 59 and 9 s at 10 ppt. Surprisingly, the sensor exhibits good robustness, including higher selectivity, long-term stability, and process stability. A comprehensive analysis of the electrical properties and energy band of inorganic materials reveals that the ultrahigh sensitivity and faster response/recovery are primarily related to the efficient transducing ability arising from the rapid electron transport and signal-amplifying effect contributed by micro-Schottky junctions. The concept of affiliating the sensing material modulation to the recepting and transducing stages and considering comprehensively provides a novel insight into the enhancement of gas sensing performance.
研究领域:
材料科学
·
传感技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Yong Yang,Shenman Yao,Wufei Gong,Yan Liang,Ting Yu,Cailei Yuan
Light excitation has been developed as an economical way to realize room-temperature gas sensing recently. However, the high recombination rate of photogenerated carriers in semiconductor gas sensing materials leads to very limited carriers that can effectively take part in sensing reactions, which greatly restricts the further performance improvement of gas sensing under light excitation. Here, a hierarchical Z-scheme heterostructure microsphere of MoS2/SnO2 is designed and prepared. The heterostructure demonstrates an outstanding NO2 sensing performance at room temperature with the excitation of a low-power LED light (0.06 W), which exhibits an ultrahigh sensitivity of 264.2 to 10 ppm of NO2 along with acceptable response/recovery properties. The physical mechanism of NO2 sensing is analyzed. The results suggest that the construction of the Z-scheme heterostructure between MoS2 and SnO2 can greatly promote the separation of photogenerated carriers so that more photogenerated carriers can take part in the NO2 sensing reaction. Furthermore, the designing of a hierarchically porous structure can provide abundant active sites for gas sensing reactions. The work not only expands the development of Z-scheme heterostructures in gas sensing but also provides a strategy to promote the performance of light-excited gas sensors by designing a Z-scheme heterostructure with a hierarchically porous structure.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 19
·5736
·
IF 4.412
Chunhua Wang,Zhiquan Yu,Yuhao Yang,Zhichao Sun,Yao Wang,Chuan Shi,Ying-Ya Liu,Anjie Wang,Karen Leus,Pascal Van Der Voort
Upgrading furfural (FAL) to cyclopentanone (CPO) is of great importance for the synthesis of high-value chemicals and biomass utilization. The hydrogenative ring-rearrangement of FAL is catalyzed by metal-acid bifunctional catalysts. The Lewis acidity is a key factor in promoting the rearrangement of furan rings and achieving a high selectivity to CPO. In this work, highly dispersed Pd nanoparticles were successfully encapsulated into the cavities of a Zr based MOF, UiO-66-NO2, by impregnation using a double-solvent method (DSM) followed by H2reduction. The obtained Pd/UiO-66-NO2catalyst showed a significantly better catalytic performance in the aforementioned reaction than the Pd/UiO-66 catalyst due to the higher Lewis acidity of the support. Moreover, by using a thermal treatment. The Lewis acidity can be further increased through the creating of missing-linker defects. The resulting defective Pd/UiO-66-NO2exhibited the highest CPO selectivity and FAL conversion of 96.6% and 98.9%, respectively. In addition, the catalyst was able to maintain a high activity and stability after four consecutive runs. The current study not only provides an efficient catalytic reaction system for the hydrogenative ring-rearrangement of furfural to cyclopentanone but also emphasizes the importance of defect sites.Keywords:Pd/UiO-66-NO2;furfural;hydrogenative ring-rearrangement;cyclopentanone;double-solvent method
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）