SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Xingyu Kang,Jianhui Lv,Lei Han,Bin Huang,Huizhang Zhao,Dong Wang,Hairui Fang
Nitrogen oxide (NO 2 ) is common by-products of industrial production, posing significant health risks to workers. Therefore, real-time monitoring of NO 2 is crucial. In this study, innovative In 2 O 3 -ZnO nano-materials were prepared by combining In 2 O 3 with ZIF-8 via electrospinning, for detecting trace amounts of NO 2 at room temperature (RT). Compared to pure In 2 O 3 , the In 2 O 3 -ZnO nano-materials (V2) with a 10 % weight ratio of ZIF-8 exhibited a significantly higher response (389.99) and a faster response time (16.9 s) to NO 2 under ultraviolet (UV) irradiation at RT. The superior gas sensing performance of the V2 nano-materials is attributed to the formation of n-n heterojunctions, enhanced optical absorption, increased oxygen vacancy ratio, and excellent dispersion among the nano-materials. The results demonstrate that V2 nano-materials can detect NO 2 at parts-per-billion (ppb) levels at RT, making them suitable for monitoring trace amounts of NO 2 in open environments. Furthermore, a portable real-time NO 2 monitoring device was constructed using V2 as the sensing material, an LM358-based amplifier circuit for data acquisition, an STM32F103C8T6 microcontroller as the main control unit, and a buzzer as an alarm device. Compared to devices using a helical Ni-Cr wire as an indirect heat source, this integrated NO 2 detection device offers real-time alarms with lower energy consumption. This application not only enhances worker health and safety in industrial environments but also demonstrates higher energy efficiency in practical application.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Fanjian Meng,Yongrui Li,Chenshuai Han,Zhaorui Zhang,Xiaohui Yan,Minghui Yang
Highly-sensitive NO 2 gas sensors based on metal oxide semiconductors (MOS) are promising but often limited by poor sensing-recovery characteristics and high operating temperatures. Herein, we address these challenges by combining Zn doping modification with mild visible light activation, effectively tuning the electronic and chemical properties of MIL-68(In)-derived In 2 O 3 nanotubes (NTs), providing an advanced approach to realize rapid recovery towards sub-ppm NO 2 at room temperature (RT). The optimized 5 at% Zn-doped In 2 O 3 (Zn x In 2-x O 3 (x = 0.10)) NTs achieves an exceptional response of 15,257 toward 10 ppm NO 2 under dark condition and a rapid 4 s recovery under visible light irradiation at RT. Additionally, the sensor exhibits superior NO 2 selectivity, excellent reproducibility and long-term stability over 36 days. The enhanced sensing performance is driven by the mesoporous frameworks which enhance free electrons transfer in the modulated energy-level structure and introduce abundant photo-induced holes via visible light irradiation at the sensing-recovery stage. This work offers new insights into surface chemistry modulation in MOS nanomaterials, advancing the development of cost-effective and low-energy-consumption room-temperature NO 2 sensors.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yajie Zhang,Yi Li,Yadong Jiang,Zaihua Duan,Zhen Yuan,Bohao Liu,Qi Huang,Qiuni Zhao,Yajie Yang,Huiling Tai
Transition metal carbides/nitrides (MXenes) have shown great potential in room temperature (RT) gas sensors, but the self-stacking of MXene sheets limits their sensitivity and response/recovery speed. In addition, the poor selectivity of MXenes sensors caused by the conventional single sensing mechanism remains a challenge. Herein, a synergistic effect of charge transfer and interlayer swelling is proposed to comprehensively improve the gas sensing performance of the MXenes toward oxidizing NO 2 . To this end, a resistive gas sensor is prepared by combining the accordion-like V 2 CT x MXene and n-type SnS 2 nanoplates . The results reveal that the NO 2 sensitivity of the V 2 CT x /SnS 2 sensor is enhanced by 581.6 times compared to the pristine V 2 CT x sensor, while achieving ultrafast response and recovery speeds (4.8/4.7 s) at 25 °C under 51.9 % relative humidity. Furthermore, the V 2 CT x /SnS 2 sensor exhibits excellent selectivity (response ratio > 5) to NO 2 . The outstanding gas sensing performances can be attributed to the synergistic sensing of charge transfer and interlayer swelling, unique structure and more active sites. This work expands the gas sensing application of the V 2 CT x MXene and promotes the in-depth combination of multiple sensing mechanisms, opening an effective avenue for developing high-performance RT NO 2 sensors.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Dong Wang,Huizhang Zhao,Haibo Yu,Yanan Chen,Xiao Ma,Eryang Shang,Hong Chen,Xingyu Kang,Jiawei Zhang,Rong Tan,Hairui Fang
Constructing heterostructures is an effective strategy to improve the performance of semiconductor metal oxide . The heterostructure exhibits strong interaction between tightly packed interfaces, showing better performance than a single structure. Therefore, indium sulfide (In 2 S 3 )/tungsten oxide (WO 3 ) composites were synthesized with heterojunction by a simple hydrothermal method to enhance the gas sensing performance of WO 3 . The WO 3 and In 2 S 3 exist in the form of nanoparticles . Then the gas sensing test of the material was carried out, by exploring the performance of WO 3 based on doping different amounts of In 2 S 3 , the response of WO 3 based on 3 wt% In 2 S 3 to 10 parts per million (ppm) nitrogen dioxide (NO 2 ) is 170.1 at the optimum operating temperature of 170 °C. Compared with pure WO 3 , the response is enhanced by seven times. Besides, the detection limit of the sample is low. The minimum detection concentration of NO 2 can reach 20 parts per billion (ppb). The reason for the improved performance can be attributed to the wider electron depletion layer or hole accumulation layer formed by the heterojunction for electron transfer . Finally, a convenient wearable NO 2 Real-time Detection System is designed to detect different concentrations of NO 2 in the factory, which provides an effective alarm mean for the excessive emission of industrial waste gas in the factory environment.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
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IF 6.3
Zhichao Yu,Jingfeng Wang,Wei Cao,Chang Luo,Shanshan Wang,Zhijun Ding,Lei Guo,Zhihong Qiao,Puhong Wang
Metal oxide semiconductor (MOS) gas sensor is an effective tool for NO 2 detection. In this work, a NO 2 sensor based on MXene-OH/ZnMnO was fabricated via a seed layer induced self-assembly method, exhibiting remarkable gas response value(280) to 100 ppm NO 2 under 25℃ and ultraviolet activation. Besides, the prepared sensor presents ultra-fast response and recovery speeds (8/40 s), low detection limit (250 ppb), and high selectivity. The enhanced sensing performance was explained by the first-principles calculations, showing that the increased electrical conductivity, more electron transfer numbers and higher adsorption energy promotes effective transport of charge carriers on the surface of sensing materials and NO 2 gas molecules.
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SmartMat
·
2022
·Vol. 4
·期 1
·e1141
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IF 0
Qiongling Ding,Zijing Zhou,Hao Wang,Zixuan Wu,Kai Tao,Bo-Ru Yang,Xi Xie,Jun Fu,Jin Wu
To date, development of high-performance, stretchable gas sensors operating at and below room temperature (RT) remains a challenge in terms of traditional sensing materials. Herein, we report on a high-performance NO 2 gas sensor based on a self-healable, recyclable, ultrastretchable, and stable polyvinyl alcohol–cellulose nanofibril double-network organohydrogel, which features ultrahigh sensitivity (372%/ppm), low limit of detection (2.23 ppb), relatively fast response and recovery time (41/144 s for 250 ppb NO 2 ), good selectivity against interfering gases (NH 3 , CO 2 , ethanol, and acetone), excellent reversibility, repeatability, and long-term stability at RT or even at −20°C. In particular, this sensor shows outstanding stability against large deformations and mechanical damages so that it works normally after rapid self-healing or remolding after undergoing mechanical damage without significant performance degradation, which has major advantages compared to state-of-the-art gas sensors. The high NO 2 sensitivity and selectivity are attributed to the selective redox reactions at the three-phase interface of gas, gel, and electrode, which is even boosted by applying tensile strain. With a specific electrical circuit design, a wireless NO 2 alarm system based on this sensor is created to enable continuous, real-time, and wireless NO 2 detection to avoid the risk of exposure to NO 2 higher than threshold concentrations.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Ye Tian,Ke-Ke Wang,Gui-Peng Yang,Pei-Feng Li,Chun-Ying Liu,Riel Carlo O. Ingeniero,Hermann W. Bange
Nitric oxide (NO) is a short-lived intermediate of the oceanic nitrogen cycle, and it is produced by biological and photochemical processes in the ocean. Nitrogen dioxide (NO2) is a reactive atmospheric compound which has not been determined in the ocean so far. Here, we present the setup and validation of a novel continuous underway measurement system to measure dissolved NO and NO2 in the surface ocean. The system consists of a seawater/gas equilibration component coupled to a chemiluminescence detector. It was successfully deployed during a 12 day cruise to the East China Sea in May 2018. Dissolved NO and NO2 surface concentrations ranged from
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Guobo Li,Kai Shen,Ling Wang,Yaping Zhang,Hongqiang Yang,Peng Wu,Bing Wang,Shule Zhang
Development of an efficient synergistic degradation technology to prevent the emission of chlorinated organics and NO x from industrial sources without forming harmful by–products, is a major challenge in environmental chemistry. The designed multi–active center catalyst (PdV/TiO 2 ) showed excellent CB/NO synergistic removal conversion efficiency and target product selectivity. Experimental and DFT calculation results indicated that Pd was the common center for adsorption of CB, O 2 , NH 3 and NO x molecules. The O vacancies (VO x –1 and TiO x –1 ) generated during the CB ring opening process was conducive to adsorption of reaction gas molecules, accelerating CBCO and NH 3 –SCR reaction. The adsorbed NH 3 species would dissociate H protons to provide Brønsted acidic sites necessary for Cl conversion. O vacancies structure was easier to be restored by reoxidation with the participation of NO 2 . Certain synergistic effect in the removal of CB and NO on the multi–active center catalyst surface was found.
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TALANTA
·
2023
·
IF 6.1
Chuan Lin,Renzhi Hu,Pinhua Xie,Guoxian Zhang,Xiaoyan Liu,Jinzhao Tong,Wenqing Liu
A newly constructed thermal dissociation cavity ring-down spectrometer (TD-CRDS) for the simultaneous measurement of ambient total peroxy nitrates (ΣPNs, RO 2 NO 2 ), total alkyl nitrates (ΣANs, RONO 2 ), and NO 2 was presented in this work. ΣPNs and ΣANs were detected as NO 2 with the CRDS instrument after thermal dissociation. PNs and ANs completely dissociated at 180 °C and 360 °C, with conversion efficiencies of 96 % and 99 %, respectively. The effects of NO 2 and NO on measurement in different temperatures and two types of thermal dissociation inlet (TDI) were further explored. The influence of ambient NO 2 and NO on PNs and ANs in the improved TDI (TDI-2) was significantly improved. To further enhance the measurement accuracy, the consistency of the observed NO 2 in the three channels was tested, which achieved good agreement. The detection limits of the TD-CRDS instrument for NO 2 , ΣPNs, and ΣANs were determined as 6.5, 6.8, and 8.6 pptv (10 s, 1σ), respectively. Observations of PNs and ANs were conducted in a suburban site in Hefei, China, from September 2–30, 2021, using the TD-CRDS instrument, and the consecutive time series of PNs and ANs were derived, verifying the capability of the TD-CRDS instrument for continuous field observations of ΣPNs and ΣANs.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Hongyuan Wu,Mohib Ullah,Lin Jiang,Jue Wang,Baihe Sun,Jun Gao,He Lv,Zhuo Liu,Keying Shi
The two-dimensional (2D) g-C 3 N 4 nanosheets have been widely recognized for their great potential in gas sensing. However, the disadvantages brought by layer stacking of two-dimensional nanosheets also seriously affect their performance and application. In this paper, three-dimensional hydrangea-like Pd-ZIF-67/g-C 3 N 4 was prepared for the detection of nitrogen dioxide gas at room temperature via a simple hydrothermal method . The Pd-ZIF-67/g-C 3 N 4 gas sensor exhibited excellent sensing properties with highest sensing response (23.8–100 ppm), ultrafast response speed (0.5 s) and lowest limit of detection (10 ppb) at room temperature. Moreover, it also manifests excellent reversibility and durability, optimal stability and commendable selectivity towards NO 2 gas. This excellent performance is due to the three-dimensional spatial configuration, synergistic effect and catalytic action of Pd . In general, the constructed structure and the proposed design strategy have a certain promoting role in promoting the creation of high performance gas sensors with three-dimensional heterogeneous structures based on two-dimensional nanosheets .
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Jian Jian,Kuiyi You,Qing Luo,Hongxu Gao,Fangfang Zhao,Pingle Liu,Qiuhong Ai,He’an Luo
Developing an economic and efficient approach for the production of adipic acid is a grand challenge in the chemical industry. Toward this goal, we report a simple method for selective synthesis of adipic acid from cyclohexane with NO2 by using Ni–Al–VPO/MCM-41 as catalyst. The physical-chemical properties of supported Ni–Al–VPO/MCM-4 catalysts were characterized, the reaction conditions were optimized, and the reusability of the catalyst was examined. The results showed that the supported 30%Ni–Al–VPO/MCM-41 catalyst exhibited excellent catalytic performance with 65.1% of cyclohexane conversion and 85.3% of selectivity toward adipic acid, especially, its catalytic performance was still stable after five runs. Maybe this developed method has potential industrial application prospects for production of adipic acid.
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ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Jing Feng,Lei Feng,Shuo Sun,Xujie Wang,Huitian Zhi,Ruhui Shang,Yingchao Yang,Luyao Wang,Zhengquan Yan,Lei Hu
Background NO 2 − and S 2− are two kinds of common toxic anions widely distributed in environmental water, soil and food products. Human beings have suffered a lot of diseases from intake of excessive NO 2 − or S 2− , i.e ., infantile methemoglobin , cancer and even to death. Although tremendous efforts have been afforded to monitor NO 2 − and S 2− , most were high instrument-depended with complex processing procedures. To keep food safety and to protect human health, it will be a huge challenge to develop a convenient and efficient way to monitor S 2− and NO 2 − in practice. Results A kind of folic acid capping Bi 3+ -doped Ag quantum dots (FA@Bi 3+ -Ag QDs) was developed for the first time by one-pot homogeneous reduced self-assembly. Not only did FA@Bi 3+ -Ag QDs possess intrinsic fluorescent property, it expressed synergistic peroxidase-like activity to catalyze the redox of 3,3′,5,5′-tetramethylbenzidine (TMB) and H 2 O 2 with K m / v max of 0.087 mM/6.61 × 10 −8 M s −1 and 6.42 mM/6.25 × 10 −7 M s −1 respectively. Interestingly, trace S 2− could exclusively alter its fluorescent property and peroxidase-like activity, exhibiting significant hypochromic and “turn-on” fluorescent effects. While trace NO 2 − could make FA@Bi 3+ -Ag QDs-TMB-H 2 O 2 system hyperchromic. Under the optimized conditions, FA@Bi 3+ -Ag QDs were applied for dual-mode recognition of S 2− and visual sensing of NO 2 − in real food samples with satisfactory recoveries, i.e ., 100.7–107.9 %/95.8–104.7 % and 97.2–104.8 % respectively. The synergistic enzyme-mimic mechanism of FA@Bi 3+ -Ag QDs and its selective response mechanisms to S 2− and NO 2 − were also proposed. Significance This represents the first nanozyme-based FA@Bi 3+ -Ag QDs system for dual-mode recognition of S 2− and visual sensing of NO 2 − , well meeting the basic requirement in drinking water set by WHO. It will offer a promising way for multi-mode monitoring of different pollution using the same nanozyme-based sensor.
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