JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 9
·5964-5974
·
IF 2.1
Zhou Xuebin,Ying Zhihua,He Xingxin,Zhang Chenhan,Zheng Xiaolong,Zheng Peng
Cellulose nanofiber (CNF), a natural polymer material with a high specific surface area, is a potential candidate for gas sensors. Here, we report Au/SnO 2 composites with excellent performance synthesized by a chemical precipitation method based on CNF-assisted synthesis, and a series of Au/SnO 2 composites were prepared by adjusting the Au content. The sensitivity of the 1.5 wt.% Au/SnO 2 sensor to a low concentration of 1 ppm NO 2 was 53, nearly 17 times higher than that of pure SnO 2 synthesized by CNF, under ultraviolet (UV) irradiation at a wavelength of 365 nm. The crystal structure of the composite was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), revealing that the composites had high crystallinity and particles reaching the nanoscale. Further experimental data showed that the CNF-assisted synthesis Au/SnO 2 sensors had good selectivity, repeatability, and stability. Additionally, the sensor is able to maintain its excellent gas sensing performance even under varying humidity conditions.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Liang Yin,Xiangqun Chu,Huimin Chen,Bin Liu,Pinhua Zhang,Lulu Du,Guangliang Cui,Li Lv
Nitrogen dioxide (NO 2 ) is a major atmospheric pollutant that poses a significant threat to human health, the development of efficient and accurate NO 2 gas sensors is crucial for air quality monitoring. Metal-organic frameworks (MOFs) are considered ideal materials for gas sensing due to their exceptional tunability, large surface area, high porosity, and abundant active metal sites. However, the poor conductivity of MOFs limits their applications in electrochemical sensors. This study presents a ZIF-67/rGO nanocomposite synthesized by combining reduced graphene oxide (rGO) with ZIF-67 via a one-step solution method. Experimental results demonstrate that the ZIF-67/rGO nanocomposite sensor shows significant sensitivity to NO 2 gas at room temperature. At 5 ppm NO 2 , the response is approximately 13-fold higher than that of the pure rGO sensor. More importantly, the sensor achieves a detection limit as low as 0.5 ppm, with an ultra-fast response time of 15 s and recovery time of 40 s at room temperature. Additionally, the sensor exhibits excellent repeatability, long-term stability, and high selectivity for NO 2 . This study presents an effective strategy for accurate real-time detection of low concentration NO 2 gas and provides valuable insights for designing MOF-based hybrid sensors at room temperature.
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
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Zhihua Zhao,Jingzhao Tian,Xiaobei Xu,Chunhua Zheng,Lan Wu
Elevated concentrations of nitrogen dioxide (NO 2 ) pose detrimental effects on the environment, contributing to pollution in water bodies, soil, and the atmosphere. Moreover, NO 2 , being a potent oxidant, can directly impinge upon the respiratory system, precipitating a range of pulmonary illnesses. Consequently, rigorous surveillance and assessment of NO 2 emissions are of paramount importance for safeguarding environmental integrity and public health. To address this challenge, we fabricated a NO 2 gas sensor using VS 2 /Ti 3 C 2 T x /TiO 2 nanocomposites. The sensors were thoroughly characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS). In our tests, the M/v-2 sensor showed excellent performance, with a response of 4.73 at 180 °C to 50 ppm NO 2 , which is 2.5 times that of the Ti 3 C 2 T x /TiO 2 sensor. Additionally, its response time was short (26 s), the recovery time was even shorter than the response time (15 s), and it demonstrated a high response speed to low concentrations of NO 2 (≤10 ppm). Furthermore, the long-term stability was excellent over a period of 45 days. The gathered characteristics indicate that our VS 2 /Ti 3 C 2 T x /TiO 2 gas sensor has great potential for NO 2 detection.
研究领域:
环境科学
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材料科学
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传感器技术
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 5
·1-10
·
IF 2.8
Kan Hao,Yang Wenhao,Guo Zilong,Li Min
Bismuth sulfide (Bi 2 S 3 ) is known for its remarkable sensitivity and stability, making it as an ideal material for gas sensor. Here, we present a highly sensitive room-temperature NO 2 gas sensor by controlling the Bi 2 S 3 nanorods morphology through hot injection method with varying Bi/S ratios (Bi/S = 1, Bi/S = 2, Bi/S = 4). The as-synthesized samples were subsequently spin-coated onto ceramic substrates to fabricate chemo-resistive gas sensors. TEM and XPS analyses revealed that with the increasing Bi/S ratio in the precursors leading to the nanorods aspect ratios enhancing and the generation of S vacancies facilitating. As a result, Bi 2 S 3 nanorods with a Bi/S ratio of 4 exhibited higher carrier mobility and provided more accessible sites for gas molecules. The optimal sensor (Bi/S = 4) showed an impressive response of 12.2 for 10 ppm NO 2 , which is 4 times higher than the device of Bi/S = 1. It also demonstrated a fast response/recovery time of 39 s/696 s and a lower detection limit down to 120 ppb. These findings highlight the excellent gas sensitivity performance of Bi 2 S 3 nanorods at room temperature and their potential for the development of energy-efficient and cost-effective gas sensors.
研究领域:
材料科学
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纳米技术
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气体传感器
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环境监测
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ji Li,Ming Yang,Jiangbin Guo,Xianfa Zhang,Yingming Xu,Xiaoli Cheng,Lihua Huo
NO 2 is a dangerous gaseous pollutant, which is also a precursor to the formation of photochemical smog and ozone. It has negative impacts on the environment and human beings at local, regional and even the whole global scale. In this context, it is imperative to develop the efficient sensing materials for detecting NO 2 gas. In this study, a near room temperature NO 2 sensing material (In 2 O 3 /SnO 2 heterostructure) with “4S” index (selectivity, sensitivity, speed, stability) was constructed, it overcomes the drawbacks of traditional detection techniques and solves the unavoidable problems of metal oxide semiconductors in the sensing process (high temperature, cross response, weak response at low concentration, etc.). Meanwhile, the synergy between the surface structure and heterostructure interface of In 2 O 3 /SnO 2 has been thoroughly analyzed. More importantly, this study also sampled and monitored ambient air samples from different geographical locations and different time points in cities, which provides strong support for promoting the application of MOS sensors in real environment.
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
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Kai Sun,Guanghui Zhan,Lin Zhang,Zilin Wang,Shiwei Lin
Developments of advanced sensors for NO 2 gas with high sensitivity and selectivity are essential but challenging. In this work, a Ce-doped ZnO nanoarray (termed as CZO) was successfully constructed via a one-pot hydrothermal method , and further demonstrated as a promising NO 2 chemiresistive sensing material. It proves that Ce doping not only changes the morphology of the initial ZnO nanoarray, but brings abundant oxygen vacancy in particular, as comprehensively proofed by scanning electron microscopy, transmission electron microscopy , and electron spin resonance spectroscopy . Gas sensing tests at 250 °C reveal that CZO-2 (Ce wt% = 2 %) offers a 10-fold higher sensing response to NO 2 and much lower limit of detection (LOD = 1.4 ppb), compared to those of the initial ZnO nanoarray. Additionally, high selectivity for NO 2 and excellent long-term stability are also obtained in such a Ce-doped sensor. Density function theory calculation results show that ZnO modulated by oxygen vacancy has a much stronger affinity toward NO 2 than pure ZnO, thus resulting in the improved sensing performance observed in CZO-2.
研究领域:
材料科学
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传感技术
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环境监测
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Yunshi Liu,Xing Gao,Feng Li,Geyu Lu,Tong Zhang,Nicolae Barsan
Pt-loaded In 2 O 3 mesoporous nanofibers (NFs) have been prepared by electrospinning, followed by a facile reduction method. The sample obtained by adding tea saponin into the spinning solution, sample In-TS, displays a more than 4 times higher specific surface area, value of 86.9 m 2 g −1 , than that of conventionally prepared samples. The loading with small-sized Pt nanoparticles (NPs) determines excellent gas sensing performance towards NO 2 down to ppb level (R g /R a = 2.8 to 10 ppb and 23.9–1 ppm) at room temperature (RT), by that significantly lowering the power consumption. The reason is that the open pores and channels on the mesoporous NFs generated by the foaming agent not only promote the adsorption and desorption of NO 2 molecules on the sensing layers, but also improves the transduction function of the sensors by ensuring that there are no parts of the fiber that are not accessible to the gases. The introduction of Pt to the mesoporous NFs could accelerate the dissociation of absorbed oxygen and the active surface reactions in NO 2 owing to the catalytic property and chemical sensitization of well-dispersed Pt NPs. Due to the unique gas sensing performance, sample In-TS-Pt has a prospect for applications in low-concentration NO 2 detection at RT.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
International Journal of Green Energy
·
2023
·
IF 3.3
Yuhang Fan,Changxin Liu,Kaiyuan Zhao,Tong Shao,Ruoshui Chen,Yilin Pan,Zhijian Liu,Xinxiang Pan
Harmful gas leakage often occurs in the engine room of ocean-going ships. Among these harmful gases, NO2 gas accounts for a high proportion. Generally, sensors for detecting NO2 gas in the machinery space have problems such as small detection range, poor sensitivity, and poor stability. Therefore, we present a novel self-powered sensing prototype using electronic printing. This prototype consists of a flexible thermoelectric film and a flexible gas sensor. At 80K temperature difference, the maximum output voltage and power of the prototype reached 102.5 mv and 64.5μw, respectively. The prototype can charge the supercapacitor (5.5 V, 0.47uF) to 5.5 v in 10 minutes. The sensitivity, selectivity and repeatability of gas sensor in different concentration gas environment were studied. The results show that in the range of 20 -100 ppm, the detection current of NO2 concentration curve is approximately linear. The prototype has good stability and repeatability. After 1,000 flexibility tests, the prototype still has high flexibility. After connecting the boost circuit, the prototype can drive the single chip microcomputer to realize the self-power supply and danger. This study provides a new way for the monitoring of harmful gases in the ship engine rooms.
研究领域:
材料科学
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环境监测
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能源技术
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lu Tang,Huimin Yang,Huajing Wang,Yazhou Yang,Xiaoxia Wang,Gen Tang,Dawen Zeng
The abundant tunable functional groups and room-temperature sensing properties of MXenes have garnered increasing interest in the field of gas sensing. However, the majority of research has exclusively focused on the combined impact of external substances with MXenes functional groups, with limited exploration into the modulation of MXenes’ intrinsic functional groups. In this work, we successfully produced molten salt-modified Ti 3 C 2 T x MXene (M-Ti 3 C 2 T x ) with tunable oxygen-functionalized surfaces using the molten salt immersion method and employed it as a chemical resistive gas sensor to detect NO 2 at room temperature (RT). Using diverse analytical techniques, we propose the O−addition effect on the surface titanium atoms and the O−substitution effect on the edge carbon atoms, refining the existence form of –O functional groups as well as realizing the effective regulation of the intrinsic functional groups. With a high response (∼25.87%−100 ppm NO 2 , whose response value is five times higher than that of pristine Ti 3 C 2 T x ), relatively rapid response speed (∼99 s−25 ppm NO 2 ), high sensitivity (∼0.29 ppm −1 ), low detection limits (theoretical LoD is 3.3 ppm), good selectivity and long-term stability (maintain stable within 28 days) at RT, the sensor based on M-Ti 3 C 2 T x demonstrates excellent NO 2 sensing performance. To understand the sensing mechanism, density functional theory (DFT) calculations were conducted to explore adsorption behaviors. Theoretical analysis validates that M-Ti 3 C 2 T x has a stronger adsorption capacity for NO 2 (E ad = −1.149 eV) owing to the formation of covalent bond between the –O functional group and the nitrogen atom of NO 2 . The application of the molten salt can effectively modulate the intrinsic functional groups of MXenes, expanding the scope of MXenes surface modification engineering and creating new opportunities for enhancing the gas sensing capabilities of MXenes.
研究领域:
材料科学
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气体传感技术
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yangyang Huo,Dongnan Zhang,Ying Yang,Zhiguang Pan,Hui Yu,Tianqi Wang,Xiangting Dong
Enhancing the stability and selectivity of flexible room-temperature gas sensors has been of extensive concern for their practical application. However, it is very challenging to combine the integration of excellent mechanical flexibility and outstanding gas sensing properties. This study presents the design of a parallel structure of ZnO//In2O3 bicomponent nanofibers using a homemade V-type dual-channel electrospinning technique. Compared with as-electrospinning pure ZnO nanofibers and pure In2O3 nanofibers, the ZnO//In2O3-2 composite nanofibers showed higher response and low detection line NO2 at room temperature. The ZnO//In2O3-2 nanofibers have a maximum high response of 109.84 to 60 ppm of NO2 at room temperature, which is about 8.44 times higher than that of the pure In2O3 nanofibers. Moreover, the theoretical detection limit for NO2 is determined to be 1.99 ppb. We have investigated the excellent flexibility of the gas sensor for potential application. These findings indicate that the flexible ZnO//In2O3-2 nanofiber sensors hold great prospect in the application of portable and room-temperature ppb NO2 detection equipment.
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
IONICS
·
2019
·Vol. 25
·期 12
·6043-6050
·
IF 2.289
Diao Quan,Zhang Xiaomei,Li Jie,Yin Yuna,Jiao Mingli,Cao Jian,Su Chaohua,Yang Kai
The phenol-formaldehyde (PF) resin microspheres were firstly used as the template in the sensing electrode (SE) preparation process of sensors based on Y 2 O 3 stabilized ZrO 2 (YSZ). The PF resin microspheres were synthesized by a facile hydrothermal method. The high char yield and the few morphological changes of PF resin microspheres before and after sintering at 900 °C indicated the perfect thermal stability at high temperature. The sensors using MnCr 2 O 4 admixed with various contents PF microspheres (0 wt%, 5 wt%, 10 wt%, and 20 wt%) were fabricated and their sensing performances on NO 2 gas were also investigated. The sensor with sensing electrode prepared by MnCr 2 O 4 with 10 wt% PF showed the best NO 2 sensing performance with a response of 110.8 mV to 100 ppm NO 2 as well as the higher sensitivity (87.4 mV/decade) with the NO 2 concentration ranging from 10 to 500 ppm at 550 °C. According to the mixed-potential mechanism, the porous electrode is good for gas penetration, so the gas can easily reach the MnCr 2 O 4 /YSZ/gas triple phase boundary (TPB) to participate in the electrochemical reactions. Additionally, the sensor exhibited excellent selectivity and repeatability, which indicated its potential application in the NO 2 detection.
研究领域:
材料科学
·
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
Jian-Bo Chen,Baosheng Li,Ying Xiong,Jie Sun
Two new fluorescent probes based on a coumarin core have been developed for the detection of nitramines (RDX and HMX) via responding to their photo-degradated nitrogen dioxide (NO 2 ). Although both probes contain the same fluorophore and recognition site, they display different fluorescent responses to NO 2 and nitramines. 8- O xime-7-dimethylamino-coumarin (8-ODC) emits traditional turn-on fluorescence toward NO 2 , which is based on the C N isomerization. In contrast, 3- O xime-7-dimethylamino-coumarin (3-ODC) exhibits a unique turn-off response with strong fluorescence quenching (about 98%) as a result of a twisted intramolecular charge transfer mechanism (TICT). In addition, 3-ODC offers a highly selective and sensitive determination of nitramines via detecting NO 2 in solution. The limit of detection of 3-ODC for NO 2 , HMX and RDX was 90 ppb, 60 nM and 90 nM, respectively. Notably, main interferents such as TNT, PETN, NO, NO 2 + and H 2 O 2 showed no obvious interference to the detection of NO 2 and nitramines. Therefore, a novel fluorescent probe (3-ODC) based on the TICT mechanism was firstly developed to detect NO 2 and nitramines by fluorescence quenching with high selectivity and sensitivity.
研究领域:
分析化学
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环境科学
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爆炸物检测
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）