CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Qian Wang,Yali Ma,Ting Yang,Yang Jiao,Dajun Lang,Yongwei Huang,Liang Cheng,Tingting Wang
As a flammable and volatile liquid, ethanol is also a marker of diabetes in children that can be rapidly detected by gas sensors based on metal oxide semiconductors. However, reducing the operating temperature and achieving high response at ultra-low concentrations remain urgent tasks. In this study, N-doped p-type MoS 2 and MIL-125(Ti) -derived n-type TiO 2 were selected to construct p-n heterostructure with rich active sites and fast carrier transport, which further optimized the detection limit of ethanol gas at lower operating temperature. Compared with pure TiO 2 , the TiO 2 @N-doped MoS 2 composite with a MoS 2 mass ratio of 60 wt% exhibits significantly improved gas sensing properties for ethanol, including lower operating temperature (160 °C), higher response value (R a /R g = 9.229 at 100 ppm), and ppb-level detection limit (1.702 at 100 ppb), as well as good repeatability and stability. These improvements in sensing performance could be mainly attributed to the electronic effects of MoS 2 , the synergistic effect of p-n junctions, and the strong adsorption energy of TiO 2 @N-doped MoS 2 composites on the ethanol gas. This work suggests that the prepared TiO 2 @N-doped MoS 2 composites are promising materials for the highly efficient detection of ethanol.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2024
·
IF 8.2
Tianyang Mo,Xianwu Xu,Tiejun Fang,Hongwei Tao,Hongbo Wang,Ming Liang Jin,Bingjun Yu,Linmao Qian,Zhi-Jun Zhao
Developing hydrogen sensors with parts per billion-level detection limits, high response, and high stability is crucial for ensuring safety across various industries (e.g., hydrogen fuel cells, chemical manufacturing, and aerospace). Despite extensive research on parts per billion-level detection, it still struggles to meet stringent requirements. Here, high performance and ppb-level H2 sensing have been developed with palladium-doped iron oxide nanotubes (Pd@Fe2O3 NTs), which have been prepared by FeCl3·6H2O, PdCl2, and PVP electrospinning and air calcination techniques. Various characterization techniques (FESEM, TEM, XRD, and so forth) were used to prove that the nanotube structure was successfully prepared, and the doping of Pd nanoparticles was realized. The experiments show that palladium doping can significantly improve the gas response of iron oxide nanotubes. Specifically, 0.59 wt % Pd@Fe2O3 NTs have high response (Ra/Rg = 41,000), high selectivity, and excellent repeatability for 200 ppm hydrogen at 300 °C. Notably, there was still a significant response at a low detection limit (LOD) of 50 ppb (Ra/Rg = 16.8). This excellent hydrogen sensing performance may be attributed to the high surface area of the nanotubes, the p–n heterojunction of PdO/Fe2O3, which allows more oxygen to be adsorbed on the surface, and the catalytic action of Pd nanoparticles, which promotes the reaction of hydrogen with surface-adsorbed oxygen.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Jinyong Hu,Xiqi Chen,Yong Zhang
High-performance formaldehyde sensors act a significant role in environmental monitoring and industrial gas analysis. However, the traditional side-heating type gas sensors fabricated by handicraft-like brush-painting or drop-casting methods still suffer from poor detection limits and the difficulty of massive fabrication, which hinders the further practical applications of gas-sensing devices. Herein, the uniform LaFeO 3 thin film prepared through a facile sol-gel method combining with spin coating is proposed to achieve batch-fabricated gas sensors for the detection of gaseous formaldehyde. The fabricated gas sensor exhibits a low detection limit as low as 50 ppb toward gaseous formaldehyde, which is lower than the guideline value (80 ppb) limited by World Health Organization. Furthermore, the gas-sensing properties of batch-fabricated thin film gas sensors reveal satisfactory uniformity and replicability with low device-to-device deviation. The maximum variation of baseline resistance between different batch samples is only 5.4%, and the maximum drift of the response value toward formaldehyde is only 6.5%. The favorable gas-sensing performances and high replicability for the sensors might be attributed to the controllable fabrication process that can be completely compatible with the well-established semiconductor technics. This work will open up an effective pathway to prompt high-performance formaldehyde sensors with ppb-level detection limits toward practical applications.
研究领域:
材料科学
·
环境监测
·
半导体技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Linghong Xue,Fan Zhang,Jiale Dang,Yu Zhang,Xu Li,Tong Liu,Qingji Wang
The room temperature gas sensor has attracted sufficient attention due to the fact that low-power products are more suitable for practical environments. However, developing gas sensors with low detection limits remains challenging. In this paper, a room-temperature sensor was prepared by in situ growth of WO 3 nanospheres on SnO 2 inverse opal (IO) by aerosol assisted chemical vapor deposition (AACVD) method, detecting ppb level of ammonia. The WO 3 nanospheres are directly fabricated on IO, and their elemental composition, morphology and structure is characterized using XRD, SEM and TEM. The results show that WO 3 nanospheres have been prepared on SnO 2 IO successfully. It showes that the WO 3 /SnO 2 (WS) type sensor has a detection limit as low as 1 ppb at room temperature from the gas sensitivity data. In addition, the sensor's response value to 100 ppm NH 3 reached 65 %. Its excellent sensing performance depends on the distinctive morphology features of WO 3 and SnO 2 . The hierarchical characteristic effectively enhances the sensing performance for NH 3 . Consequently, this presents a feasible solution for fabricating the room temperature NH 3 sensor.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Qi Zhao,Zihan Liu,Ziyue Xu,Bowen Li,Siqi Yang
The real-time and effective detection of n-butanol gas is particularly important in production and daily life due to its flammability, toxicity, and potential hazards to the environment. This article reports the preparation of hollow indium oxide spheres and rGO/In 2 O 3 composites through a simple hydrothermal and subsequent heat treatment method. Test results indicate that the gas sensitivity of n-butanol can be significantly improved through rGO composites. The prepared hollow indium oxide spheres are composed of nanosheets with a diameter of probably 500 nm. After combination by rGO, the specific surface area and the proportion of adsorbed oxygen of the material are increased, both of which are advantageous for enhancing gas sensitivity abilities. At the optimum operating temperature of 160 °C, the response value of rGO/In 2 O 3 complex sensor is 51–50 ppm of n-butanol, which is 3.6 times the response of pure In 2 O 3 . Gas sensors composed of rGO/In 2 O 3 exhibit ultra-fast response time and low detection limit. Even for ppb grade (100 ppb) n-butanol gas, the response value is still 2.3. These characteristics make rGO/In 2 O 3 a promising material for the preparation of high-performance n-butanol gas sensors. Besides, the gas-sensitive mechanism of the enhanced n-butanol sensing performances is also analyzed.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yu Qiao,Jinniu Zhang,Jia Liu,Yumeng Liu,Xinlei Zhang,Zhibo Yang,Xiaoqiang Yin,Jianzhi Gao,Chunlan Wang,Hongbing Lu
NO 2 is one of the most important atmosphere pollutants, causing great harm to the human body at very low concentrations (ppb levels). Herein, a novel fabrication idea for gas sensing materials was reported to detect ppb-level NO 2 via MOF-derived porous In 2 O 3 nanospheres (NSs) sensitized by CdS quantum dots (QDs). The good distribution of CdS QDs (2.5–4.0 nm) on porous In 2 O 3 NSs was verified by the transmission electron microscopy and element mapping analyses. In comparison to In 2 O 3 NSs, the CdS@In 2 O 3 composite nanospheres (CNSs) exhibited exceptional responses to ppb-level concentrations of NO 2 ( S =425.1@100 ppb) at room temperature (RT, 25 °C), while also demonstrating good selectivity and response reproducibility. These improvements in sensing performance were attributed to the synergies of the electronic effects of CdS QDs, MOF-derived porous nanostructures , and enhanced adsorption of NO 2 and active O 2 – by well-dispersed CdS QDs. This work emphasizes that the MOF-derived In 2 O 3 porous NSs sensitized by CdS QDs can accurately detect ppb-level concentrations of the NO 2 at RT.
研究领域:
材料科学
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环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
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.
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
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Qing Han,Xiaoxiao Sui,Gongao Jiao,Zuozhe Ding,Hao Zhang,Dongzhi Zhang
In this work, a low-temperature formaldehyde sensor based on a hydrothermally synthesized tin dioxide/tin selenide (SnO2/SnSe2) nanostructure was demonstrated. The SnO2 nanosheets were decorated on the SnSe2 nanoblocks. The microstructural characterization proves this unique morphology. At 150 °C, the SnO2/SnSe2 composite gas sensor exhibits more than three times the response to formaldehyde gas compared to pure SnO2, with a response of 13.47 to 10 ppm formaldehyde and a response recovery time of 63 s/12 s. In addition, the SnO2/SnSe2 gas sensor is capable of detecting formaldehyde gas at the ppb level. The sensor also exhibits excellent repeatability, excellent long-term performance stability, and resistance to humidity interference. The n–n heterojunction formed between SnO2 and SnSe2, along with its unique microstructure, significantly enhances the performance of the SnO2/SnSe2 sensor. The adsorption behavior of formaldehyde molecules on sensitive material surfaces was studied by using density functional theory.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Kun Li,Xiaofang Li,Xiao Chang,Xurong Qiao,Ya Xiong,Fujun Xia,Qingzhong Xue
ABSTRACT The demand of acetone gas sensors with great response value and fast response/recovery time to low concentration acetone is increasing in practical diagnosis for diabetes. In this work, metal-organic frameworks (MOFs) derived flower-like ZnO/Co 3 O 4 heterojunctions based sensor is prepared by a simple solution mixing method at room temperature. The sensor shows high acetone response value, short response/recovery time, excellent selectivity and good stability. For example, the response value of ZnO/Co 3 O 4 heterojunctions based sensor is up to 120 % towards 500 ppb acetone at 300 ℃, which is about 30-fold enhancement than these of intrinsic ZnO and Co 3 O 4 . Moreover, its minimal detection limitation is 100 ppb acetone and it shows ultra-fast response/recovery time for ppb-level acetone (22 s/27 s@500 ppb). The excellent acetone sensing properties of flower-like ZnO/Co 3 O 4 heterojunctions based sensor is attributed to the sharp resistance variation of heterojunction interface between ZnO and Co 3 O 4 and the ultra-fast gas transport channel provided by ZnO nanosheets. This finding provides important insights and useful guidance for the detection of ppb-level acetone.
研究领域:
材料科学
·
传感器技术
·
医学诊断
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Yanqiao Ding,Yinpei Luo,Chun Huang,Shifu Gu,Bingsheng Du,Yingchun Dong,Yijie Shi,Hangyu Liu,Mati Horprathum,Wei Hu,Yong He
Achieving highly sensitive detection of ppb-level NO2 at room temperature remains a significant challenge for metal oxide semiconductors (MOS) due to their low chemical activity. Herein, a synergistic sensitization strategy is proposed, combining highly conductive MXene with high specific surface area mixed MOS. In this work, NiO–SnO2 is synthesized by thermal annealing using Ni–Sn–BTC (BTC: benzene-1,3,5-tricarboxylic) as a template. The mesoporous structure and high conductivity of NiO–SnO2/Ti3C2Tx provide a variety of channels for gas diffusion and carrier transfer. Gas sensor tests reveal that the fabricated NiO–SnO2/Ti3C2Tx sensor exhibits a 4.33-fold improvement in response (Rg/Ra = 70.86 to 200 ppb) to 200 ppb of NO2 at room temperature (RT, 25 °C) compared to NiO–SnO2. In addition, the sensor also maintains a low detection limit (50 ppb), superior selectivity (response ratio >30), good repeatability (RSD: 2.3%), and long-term stability at RT and 60% RH (RH: relative humidity). The outstanding sensing properties are mainly attributed to the functionalized surfaces and multiple-type heterojunctions formed by NiO, SnO2, and Ti3C2Tx phases, which significantly improve gas adsorption and electrical transduction function of the sensor.
研究领域:
材料科学
·
传感器技术
·
化学检测
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 19
·1471
·
IF 4.3
Liming Song,Xiaoxin Dou,Jianmei Shao,Yuanzheng Luo,Fumiao Liu,Chengyong Li,Lijuan Yan,Chuhong Wang,Yuting Li,Yuqing Cai,Jinsheng He,Zhenqing Dai,Ruikun Sun,Qin Xie
Hierarchical NiO-SnO 2 nanoflowers were prepared via a one-step hydrothermal method. The morphology, structure and components of the hierarchical NiO-SnO 2 nanoflowers were examined via scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The ethanol gas-sensing performance was systematically analyzed between pure hierarchical SnO 2 nanoflowers and the hierarchical NiO-SnO 2 nanoflowers. The results indicated that the hierarchical NiO-SnO 2 nanoflowers showed better gas-sensing properties than the pure hierarchical SnO 2 nanoflowers at 164 °C. The enhanced gas-sensing performance was ascribed to the formation of p-n heterojunctions between p-type NiO and n-type SnO 2 . Additionally, NiO has a catalytic role. Therefore, hierarchical NiO-SnO 2 nanoflowers could be a potential gas-sensing material for the fabrication of high-quality ethanol gas sensors.
研究领域:
材料科学
·
纳米技术
·
传感器学
·
无机化学
·
功能材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Ning Sui,Peng Zhang,Tingting Zhou,Tong Zhang
For realizing high-performance ozone (O 3 ) sensing, hierarchical branch-like In 2 O 3 (B-In 2 O 3 ) nanomaterials were designed and prepared via a facile co-precipitation method. The unique In 2 O 3 structure consists of abundant nano-rods with the length of ca. 450 nm enabling effective adsorption and diffusion of oxygen and O 3 molecules. The sensors based on B-In 2 O 3 showed sensitive O 3 sensing performances at a relative low working temperature. The response of B-In 2 O 3 based sensors to 100 ppb of O 3 is 44 at 70 °C, which is 4.9-fold higher than the commercial In 2 O 3 (C-In 2 O 3 ) particles. The limit of O 3 detection was as low as 30 ppb. Moreover, the gas sensor exhibited excellent selectivity and device stability. The great sensing behavior is proved to be closely related to the oxygen-chemisorbed ability and large specific surface area of In 2 O 3 materials. Taken together, this work provides a potential sensing platform for highly sensitive and ppb-level O 3 detection.
研究领域:
材料科学
·
纳米技术
·
传感器学
·
环境监测
·
气体传感材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）