APPLIED SURFACE SCIENCE
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2024
·
IF 6.3
Yanping Zhao,Xuxia Shai,Qihang Zhou,Kaiyuan Shen
Developing exhaled acetone sensors with high performance can be effectively applied to the medical diagnosis and the health monitoring. Herein, a two-dimensional (2D) layered graphitic carbon nitride (g-C 3 N 4 ) with tunable electronic structure, abundant edge sites, and high stability is proposed, and it is further coupled with stannic oxide (SnO 2 ) by one-step hydrothermal approach to construct a Mott-Schottky heterostructure with layered nanorods array. The exceptional response of the as-fabricated g-C 3 N 4 /SnO 2 gas sensor to 50 ppm acetone at 100 °C is four times higher than that of the pristine SnO 2 sensor. Additionally, the g-C 3 N 4 /SnO 2 sensor's remarkable selectivity, long-term stability against acetone gas, and detection limit of 250 ppb are exhibited. The unique hierarchical design and the Mott-Schottky heterostructure creation which validated by electrochemical study, may be in charge of the enhanced acetone sensing capabilities of g-C 3 N 4 /SnO 2 gas sensor. This work will provide a concise and effective avenue to construct hierarchical composite with Mott-Schottky heterostructure for high-performance acetone gas sensor.
研究领域:
材料科学
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医学诊断
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传感器技术
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jian Ding,Zhen Li,Yongchao Wang,Yi Liu,Fei Li,Xinru Yu,Peiqi Huang,Yang Wang
Thermally excited oxygen activation is the key to realize gas sensing by semiconductor. However, the relevant strategies and mechanisms are rarely studied. Herewith, the model material of highly oxygen catalytic active Ir doped WO 3 (Ir-WO 3 ) is prepared to elucidate the impact of enhanced oxygen activation on sensing performance. Interestingly, the 0.5 wt% Ir doped WO 3 successfully reduced the working temperature of WO 3 from 370 to 260 ℃ and significantly enhanced the response from 25.1 to 127.9 (at 50 ppm) for acetone. Meanwhile, the sensor also has fast response/recovery times (∼8.3/3.8 s), long-term stability, low detection limit (19 ppb) and high selectivity. Gas sensitive performance tests, in situ -DRIFTS and DFT calculations reveal that the Ir doping facilitates the oxygen adsorption and activation, which can significantly weaken the activation energy of acetone at low temperatures and contribute to enhance sensing performance. Our work paves a new pathway to improving metal oxide-based gas sensors at lower operating temperatures.
研究领域:
材料科学
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传感器技术
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
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2020
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IF 0
Xiangyan Hou,Huanhuan Liu,Yimeng Zhang,Mengpei Jiang,Long Yuan,Jingyu Shi,Changmin Hou
Cd-doped In 2 O 3 was synthesized by a facile solvothermal, template-free preparation method. The phase structure and properties were characterized by various methods. The surface of Cd-doped In 2 O 3 became coarse compared with that of pure In 2 O 3 , according to the scanning electron microscopeimages, which enhanced the ability to absorb the gas. The electron paramagnetic resonance showed that the Cd-doped In 2 O 3 can generate more defects and oxygen vacancies . By measuring the gas sensitivity, the response of Cd-doped In 2 O 3 was 1.6 times than that of pure In 2 O 3 . Thus, Cd-doped In 2 O 3 can promote gas-sensing performance compared with pure In 2 O 3 .
研究领域:
材料科学
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化学传感器
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纳米技术
✓ 已验证
产品关联
DOI
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 32
·15089-15098
·
IF 3.3
Qixuan Qin,Na Liu,Yan Zhang,Weiyi Bu,Zhijie Zhou,Changhua Hu,Xiaohong Chuai
The sensitivity and selectivity of semiconductor metal oxides can be effectively improved by transition metal doping and noble metal loading. In this work, Ag-loaded p-type Zn-doped Fe2O3 (Ag@Zn–Fe2O3) nanoparticles were synthesized by a combination of a one-step hydrothermal route and a co-precipitation method. The prepared Ag@Zn–Fe2O3 nanoparticles show a peanut-like structure with a size of about 50–150 nm. The Zn doping and the Ag loading can synergistically improve the response of the Fe2O3 nanoparticles to acetone. At the optimum operating temperature (150 °C), the response of the Ag@Zn–Fe2O3 sensor to 100 ppm acetone is 50.2, which is significantly higher than 8.9 and 25.8 corresponding to Fe2O3 and Zn–Fe2O3, respectively. In addition, the Ag@Zn–Fe2O3 sensor exhibits excellent selectivity, good moisture resistance, and long-term stability to acetone. Meanwhile, the possible mechanism of the improved acetone sensing properties is also discussed.
研究领域:
材料科学
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化学传感器
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xujie Chen,Qiaoling Xing,Xuan Tang,Yong Cai,Ming Zhang
Accurate and quick determination of acetone concentration is crucial for the diagnosis and prevention of health risks. However, semiconductor metal oxide-based gas sensors have poor selectivity for organic volatile gases. In this study, the machine learning algorithm is employed to improve the performance of acetone sensors based on indium-doped cerium dioxide. CeO 2 –In series sensors are prepared by adjusting the doping ratio of indium in CeO 2 nanorods. CeO 2 –In10 % to 100 ppm acetone show a response (2.52) of 2.17 times higher than pure CeO 2 at 300 °C. Indium doping increases specific surface area and reduces response time to 1.1 s. Based on the obtained gas-sensitive data, a machine learning algorithm is used to analyze the gas types. Machine learning classifies gases with 97.5 % accuracy (Random Forest). The idea of using machine learning to improve the selectivity of acetone sensors may provide a new way for the study of metal oxide semiconductor gas sensors with high selectivity.
研究领域:
材料科学
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医学诊断
·
传感器技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Xiao Chang,Xurong Qiao,Kun Li,Ping Wang,Ya Xiong,Xiaofang Li,Fujun Xia,Qingzhong Xue
It is challenging for current metal oxides based acetone sensors to realize excellent ppb-level acetone sensing properties at low working temperature. Herein, the hollow ZnO/MoS 2 nanosheets (HZnO/MoS 2 ) core/shell heterogeneous structures are originally produced. Fast gas transport channels and n–p heterojunctions are produced by the decoration of MoS 2 nanosheets on HZnO surface, resulting in high acetone response and fast response/recovery speed. Ultraviolet (UV) light is introduced to further improve acetone response and drastically reduce working temperature. The light diffraction and reflection caused by the decoration of hierarchical MoS 2 nanosheets could significantly enhance light harvesting. Hence, the excellent acetone sensing properties are obtained by the synergistic effect of UV light and HZnO/MoS 2 core/shell heterogeneous structures. Exactly, at 100 °C, the HZnO/MoS 2 possesses a stable response (1.52) to 100 ppb acetone with UV irradiation while it exhibits no response to 100 ppb acetone without UV. Even at room temperature (30 ℃), UV activated HZnO/MoS 2 still exhibits a stable response (∼1.33) and fast recovery/recovery time (19 s/97 s) to 50 ppm acetone. Furthermore, the DFT calculations are performed to demonstrate the underlying acetone sensing mechanism. The results demonstrate that UV activated HZnO/MoS 2 heterostructure could achieve trace-acetone detection at low temperature.
研究领域:
材料科学
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传感器技术
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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
·
2018
·
IF 5.667
Yan Li,Zhongqiu Hua,Yi Wu,Yan Zeng,Zhilei Qiu,Xuemin Tian,Mengjun Wang,Erping Li
In this paper, WO 3 nanoparticles in a lamellar-structured were fabricated via an acidification method and the surface of nanoparticles were catalytically modified by Ru through a modified impregnation method based on an electronic adsorption mechanism. Gas sensors based on neat and Ru-loaded WO 3 nanoparticles were fabricated based on screen printing and sensor responses of acetone were evaluated under a dry and humid ambient, respectively. Experimental results clearly indicated that most of Ru was removed from the WO 3 during the washing process, however, a strong sensitization effect of Ru was achieved with a very few loading amount. Accordingly, the basic sensitization mechanism of Ru was investigated based on TPR results and oxygen adsorption behaviors. It is revealed that Ru is loaded on the surface with an oxidized state contributing to an electronic sensitization effect. In addition, Ru on the surface of WO 3 as a catalyst significantly enhanced the activity of surface lattice oxygens. As a consequence, surface lattice oxygens could also react with acetone and reduce sensor resistance leading to a sensitization effect. However, we do not expect that reactions of lattice oxygens dominate the sensing process.
研究领域:
材料科学
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传感器技术
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Xiao Chi,Changbai Liu,Li Liu,Yu Li,Zhijun Wang,Xiaoqing Bo,Lili Liu,Chang Su
WO 3 nanotubes have been successfully synthesized by electrospinning and followed by calcination . The synthesized WO 3 nanotubes have been characterized by scanning electron microscope (SEM) and X-ray powder diffraction (XRD). Based on the experimental results, the average diameter of the WO 3 nanotubes is about 200 nm. Gas sensors based on WO 3 nanotubes were made in order to investigate their gas sensing properties. The gas sensing measurements were evaluated toward different concentration of some gases including acetone, ethanol, methanol, ammonia, hydrogen, carbon monoxide and butane at 250 °C. The results reveal that the WO 3 nanotubes are promising acetone sensing material owing to their high response and good selectivity.
研究领域:
材料科学
·
纳米技术
·
传感器学
·
分析化学
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 5
·3899-3909
·
IF 2.22
Tian Chen,Zhou Min,Hua Zhongqiu,Yuan Wenjing,Wu Yi,Tian Xuemin,Song Tao
In the present work, gas sensors based on Cr 2 WO 6 nanoparticles were fabricated by a screen-printing technique, and the sensing properties were characterized with acetone and other typical reducing gases under both dry and humid air backgrounds. Interestingly, it was found that Cr 2 WO 6 sensors showed a p-type conduction characteristic with a highly sensitive response to acetone vapor in a relatively low concentration. In the presence of humidity, resistances of Cr 2 WO 6 sensors were significantly increased; nevertheless, sensor responses were obviously inhibited. In addition, the basic sensing mechanism of Cr 2 WO 6 sensor was also investigated based on oxygen adsorption behavior and catalytic properties of Cr 2 WO 6 surface. According to experimental results, it is proposed that the resistive responses of Cr 2 WO 6 sensor to reducing gases were highly oxygen-dependent, indicating that the surface oxygen adsorption and reaction also played the basic role in the sensing process as that observed in typical n-type MOS sensors. Additionally, sensors also suffered from a high cross-sensitivity to water vapor due to the competition of chemisorption of water and oxygen on the surface of Cr 2 WO 6 .
研究领域:
材料科学
·
传感器技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2023
·
IF 3
Ensi Cao,Yixuan Zhang,Yongjia Zhang,Wentao Hao,Bing Sun,Li Sun
To enhance the acetone sensing capabilities of LaFeO 3 nanoparticles for practical applications in breath analysis, commercial n-type rutile TiO 2 nanoparticles were utilized as additives and directly mixed with LaFeO 3 nanoparticles synthesized via a sol–gel method. The obtained TiO 2 -LaFeO 3 nanocomposites were characterized by XRD, SEM, BET, and XPS. Compared to pure LaFeO 3 nanoparticles, the resulting TiO 2 -LaFeO 3 nanocomposites exhibited higher surface reactivity, as evidenced by their larger specific surface areas and higher oxygen vacancy contents. The introduction of TiO 2 also facilitated the formation of p-n heterojunctions, which enhanced the regulation of acetone molecules on internal carrier conduction within the nanocomposites. Therefore, the TiO 2 -LaFeO 3 nanocomposites demonstrated improved acetone sensing performance, including higher vapor response values, selectivity, and faster response/recovery speeds. Among the series of nanocomposites, those with an addition of 10 wt% TiO 2 exhibited the highest vapor response value (37.3 to 100 ppm) and the greatest selectivity against methanol and ethylene glycol at the prime operating temperature of 144 °C.
研究领域:
材料科学
·
纳米技术
·
传感器
·
表面化学
·
呼吸分析
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Rong Guo,Yongsheng Deng,Yinghao Jia,Caixin Shi,Wenpu Zhang,Ying Zhou,Xinghui Hou
In order to monitor the quality of the surrounding environment and realize the non-invasive screening of diabetes, it is necessary to develop a simple and sensitive acetone sensor. In this paper, GC x porous structures doped with different proportions of Ga element are prepared through calcining Co-MOF synthesized by solvothermal method . The findings indicate that the addition of Ga inhibits the further growth of grain and improves the uniformity of the adhered nanoparticles in GC x . Performance test shows that the GC4 sensor exhibit extremely ultra-high response (197.6, 50 ppm) acetone at 160 °C and relatively low detection limit of 0.1 ppm (2.3). The main reason for the significant improvement of GC x acetone sensitivity is that the introduction of Ga regulates the oxygen vacancy which provide rich reaction activation sites for the further reaction and diffusion of acetone and amplify resistance change by modulating the carrier concentration. A practical method for controlling oxygen vacancy and carrier concentration of sensing materials is shown in this work, which creates a new opportunity for the development of high-performance acetone sensors.
研究领域:
材料科学
·
化学传感器
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Liyong Du,Jing Pan,Qing Dong,Yi Liu,Heming Sun
Multi-shelled hollow structures have been drawing wide attention in various fields because of their large surface area , short diffusion path and less agglomerated configuration. Herein, ZnSnO 3 hollow microspheres with controllable shell numbers have been prepared by a facile solvothermal reaction and following annealing treatment. The test results show that multi-shelled ZnSnO 3 hollow microspheres exhibit excellent acetone sensing performance, which is superior than that of double-shelled samples. In particular, multi-shelled ZnSnO 3 hollow microspheres not only show high responses of 105.1 and rapid response/recovery speed (1/18 s) to 100 ppm acetone, but also exhibit good repeatability, long-term stability and anti-humidity properties. Furthermore, they can easily distinguish healthy breath from simulated diabetic breath. And they still show rapid response/recovery speed in actual breath detection, which is beneficial to the achievement of real-time detection. The enhanced sensing performance has been studied systematically. Thus, multi-shelled ZnSnO 3 hollow microspheres have a great potential for the diagnosis of diabetes.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
·
纳米医学
·
转化医学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）