Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-8
·
IF 3.125
Segovia Rubén,Qu Geyang,Peng Miao,Sun Xiudong,Shi Hongyan,Gao Bo
Self-assembled organic-inorganic CH 3 NH 3 PbI 3 perovskite microwires (MWs) upon humidity exposure along several weeks were investigated by photoluminescence (PL) spectroscopy, Raman spectroscopy, and X-ray diffraction (XRD). We show that, in addition to the common perovskite decomposition into PbI 2 and the formation of a hydrated phase, humidity induced a gradual PL redshift at the initial weeks that is stabilized for longer exposure (~ 21 nm over the degradation process) and an intensity enhancement. Original perovskite Raman band and XRD reflections slightly shifted upon humidity, indicating defects formation and structure distortion of the MWs crystal lattice. By correlating the PL, Raman, and XRD results, it is believed that the redshift of the MWs PL emission was originated from the structural disorder caused by the incorporation of H 2 O molecules in the crystal lattice and radiative recombination through moisture-induced subgap trap states. Our study provides insights into the optical and structural response of organic-inorganic perovskite materials upon humidity exposure.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yibin Bu,Yafeng Chen,Guiming Jiang,Xinmei Hou,Shun Li,Zuotai Zhang
To design an efficient catalyst for HCHO oxidation, it requires good understanding of the correlation between structural properties of catalyst and the reaction mechanism. We investigated performance of commercial CeO 2 (CeO 2 -C) and nanorod CeO 2 (CeO 2 -R) and the corresponding Au/CeO 2 catalysts in HCHO oxidation. Reactivity tests showed that Au/CeO 2 -R is highly efficient and stable in HCHO oxidation at room temperature, which is attributed to the highly active Au-CeO 2 -R interface. The strong interaction between Au and CeO 2 -R greatly promotes the creation of oxygen vacancies and Au 3+ near the interface, which promotes the formation of formate. The conversion of formate can follow both a decomposition and a direct oxidation pathway, which is remarkably enhanced by the coexistence of Au 3+ and oxygen vacancies. In addition, formate accumulation and Au particles aggregation led to deactivation. The presence of humidity promotes the oxidation of formate, which improves the reactivity and stability of Au/CeO 2 in HCHO oxidation.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zicheng Zheng,Hanwen Chi,Liyuan Zhang,Denghui Huang,Kaixin Wang,Luqman Ali Khan,Zhizhen Ye,Jie Jiang,Liping Zhu
Metal oxide gas sensors have been widely used in various applications since their inception and have garnered significant attention. However, achieving accurate and selective detection of acetone at the parts per billion (ppb) level, particularly in high-humidity environments, remains challenging. Here, we present an advanced yolk-shell structure combining of Pt-based bimetals and indium oxide, offering significantly improved acetone detection performance. Specifically, the PtPd@In 2 O 3 sensor exhibits an exceptional detection limit of 20 ppb and a rapid response time of 4 s for acetone. The sensor achieves a response value of 93.44 to 1.8 ppm acetone in a dry environment and maintains at 20.24 under 95 % relative humidity. In-situ infrared diffuse reflectance experiments revealed that the acetone response mechanism deviates from previous assumptions, exhibiting temperature-dependent intermediate phases, particularly at evaluated temperatures. This study not only highlights the potential of PtPd@In 2 O 3 as a high-performance gas sensor but also offers novel insights into the acetone sensing mechanism, paving the way for the development of advanced gas-sensitive materials and innovative structural designs.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Smart Materials and Structures
·
2020
·Vol. 30
·期 2
·025004
·
IF 3.613
Shiping Li,Hu Liu,Zicai Zhu,Xiaofei Sun,Zhenhua Tang,Yan Guo,Qiao Hu,Yong Zhang
Besides bending sensor, ionic polymer materials can work as pressure sensor based on ion migration and show more potential in engineering application. To explore a better ionic polymer material for pressure sensor, three typical ionic polymer materials, Nafion, poly(vinylidene fluoride)/ionic liquid (IL/PVDF) composite, thermoplastic polyurethane/ionic liquid (IL/TPU) composite, were selected to comparatively investigate the sensing properties under an applied pressure. Ionic polymer pressure sensors with circular truncated cone structure were developed by casting method. Their voltage responses were evaluated by a self-made test platform under a series of step force. The voltage sensitivity and the stability were obtained by performing the tests at different ambient humidity levels. The sensitivity of Nafion sensor was influenced by the ambient humidity heavily, which increased from 8.97 mV N−1 (28.17 mV MPa−1) to 31.11 mV N−1 (97.69 mV MPa−1) as the relative humidity (RH) increasing from 30% RH to 90% RH. In comparison, the voltage responses of IL/TPU sensor and IL/PVDF sensor were rarely influenced by the humidity because of the stability of IL, but strongly related to the content of IL. As the IL content increasing from 30 wt.% to 50 wt.%, the sensitivity of IL/TPU sensor increased from 5.65 mV N−1 (17.74 mV MPa−1) to 16.55 mV N−1 (51.97 mV MPa−1), that of IL/PVDF sensor increased from 14.12 mV N−1 (44.33 mV MPa−1) to 32.23 mV N−1 (101.20 mV MPa−1) monotonously. The underlying mechanisms were revealed based on water exchange in air and ion transport theory qualitatively. IL/PVDF sensor with 50 wt.% IL content shows the best sensing performance in air and is promising for practical application.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Zijian Wang,Yajing Chen,Jishun Guo,Dongzhi Zhang,Mingcong Tang,Yuehang Sun,Xingyan Shao
Hydrogen (H 2 ) is one of the most critical gases in transformer oil. In this paper, an H 2 sensor based on spindle-shaped multilateral CeO 2 rods in micron size and TiO 2 quantum dots (QDs) with an average size of 3.09 nm was designed. The sensor based on CeO 2 with 1 wt%TiO 2 has the best performance and is labeled as Ce–Ti1 sensor. The Ce–Ti1 sensor operates at 250 °C and has the better response value of 52.51% to H 2 of 1000 ppm. The response time is less than 1 s for 2000 ppm H 2 and the response time is 1 s. The Ce–Ti1 sensor has low response values for several dissolved gases in transformer oils (5.78 times than 1000 ppm C 2 H 6 , 9.28 times than 50 ppm CO, and 18.04 times than 1000 ppm CH 4 ). The response of the Ce–Ti1 sensor is affected by humidity, while it shows good long-term stability and repeatability. The response intensity can decrease by 50.21% in RH = 85% compared with sensing performance in RH = 33%. First-principle calculations are used to analyze the H 2 -sensing properties of TiO 2 , CeO 2 , and their composite heterostructures from a microscopic perspective. The adsorption mechanism between the Ce–Ti1 heterojunction and H 2 molecules is analyzed by the adsorbed oxygen mechanism. The construction of DFT calculations and H 2 -sensitive mechanism models can provide guidance for the subsequent construction of high-performance CeO 2 -based gas sensors.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Fangda Wei,Wenyu Wang,Xi Cui,Feng Wu,Zhixiong You,Lin Yue,Jinjun Li
For the adsorptive removal of polar heteroatom-containing volatile organic compounds (VOCs) from the air, the polar groups of the adsorbents allow for enhanced adsorption forces, however, they also facilitate the competitive adsorption of the coexisting water. Therefore, the design of adsorbents for polar VOCs requires a rational trade-off between adsorption forces and moisture resistance. In this work, activated carbon (AC) was modified by single-atom Al using an adsorption method, and the adsorption performances for some oxygenated and chlorinated VOCs were studied. Compared to AC, the adsorption capacities of the single-atom Al-modified AC for methanol, ethanol, dichloromethane, and 1,2-dichloroethane increased by 45 %, 11 %, 9 %, and 10 %, respectively, under dry conditions, and by 31 %, 13 %, 9 %, and 9 %, respectively, at a relative humidity of 60 %. In contrast, modifying AC by particulate Al species using an impregnation method led to decreased adsorption performances under humid conditions. Density functional theory computations demonstrated that the Al atoms coordinated to functional groups of AC feature particularly high adsorption energies for the polar VOCs, and the hydroxyl groups bonded to the Al atoms also serve as additional adsorption sites. On particulate Al species, the densely populated hydroxyl groups favor the adsorption of water molecules through intensified hydrogen bonding, promoting the rapid formation of water clusters and severely blocking the adsorption sites for VOCs. Such a negative effect on VOCs adsorption can be mitigated on atomically dispersed Al species. The single-atom Al-modified AC can be a readily available adsorbent for the emission control of polar VOCs.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ChemNanoMat
·
2024
·Vol. 10
·期 7
·e202400053
·
IF 2.6
Yuqian Fei,Zizhuo Nie,Shujiang Ding,Jiuhong Wang,Wei Yu,Na Li,Yuhang Liu,Bo Peng,Xiaoli Feng,Limin Liu,Xinbing Jiang
Gas sensors for ammonia (NH 3 ) play a crucial role in the maintenance of air quality, preservation of the atmosphere, and evaluation of human health. However, the endeavor to attain a high level of sensitivity in detecting NH 3 under ambient conditions remains a challenging task. In this work, poly(3-hexylthiophene)s and titanium dioxide (P3HT-TiO 2 ) heterostructure NH 3 gas-sensitive material was prepared, and by drop-casting the material onto a substrate with Au interdigital electrodes, a sensor for high-response detection of NH 3 at room temperature was constructed. The designed gas sensor exhibited a high response signal of 114.61 % toward 15 ppm NH 3 at room temperature (25 °C) with good reproducibility, strong long-term stability, and excellent selectivity. Moreover, by analyzing the response law of the sensor under different humidity conditions, it has been noted that both excessively high and excessively low levels of humidity adversely affect the sensor's response. The remarkable increase in NH 3 sensing properties is attributed to the synergistic enhancement effect of P−N heterojunction formed between P3HT and TiO 2 . This NH 3 gas sensor exhibits tremendous potential for use due to its straightforward structure and outstanding ammonia sensing performance.
研究领域:
材料科学
·
环境科学
·
化学传感器
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Chaozhu Huang,Jingwei Zhao,Haichuan Guo,Ziqin Zhuang,Xiaohang Wang,Jiuyang Yu,Fengdong Qu,Minghui Yang
Gas sensing catalyst is the key to proton exchange membrane fuel cell type gas sensor. However, due to the limitations of Pt/C catalyst in an electronic structure and electrochemical stability, the sensing performance of the sensor inconformity the strict performance objectives, and new sensing materials are required. Here we demonstrate that a novel sensing catalyst, Pt/Ti 0.8 Mo 0.2 N, is a highly efficient CO sensing that outperforms the benchmark material Pt/TiN and Pt/C. Pt/Ti 0.8 Mo 0.2 N effectively reduces the cross-sensitivity of interfering gas and greatly improves the CO selectivity, sensitivity and long-term stability of the sensor. Simultaneously, profit by the design of a high humidity cathode sealing chamber, the relative humidity of the environment exhibits a slight impact on the sensor. Furthermore, we confirm that Pt/Ti 0.8 Mo 0.2 N exhibit the best gas sensing performance at low Pt loading of 15 wt%. This discovery points to the strategy of combining low-cost and high-performance electrode catalytic materials for new generation gas sensors.
研究领域:
材料科学
·
传感器技术
·
燃料电池
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Boxuan Yang,Xian Li,Zhongqiu Hua,Zhemin Li,Xiangnan He,Rui Yan,Yanhao Li,Zinan Zhi,Chen Tian
Agricultural activities produce substantial amounts of ammonia (NH 3 ), affecting agricultural ecology and resulting in environmental pollution. NH 3 detection based on sensor technology in the field has long been a challenging topic. Detection can be hampered by multiple interfering gases, as well as fluctuations in temperature and humidity, which can cause signal failure. Here, a simple and systematized NH 3 monitor coupled with a differential catalytic conversion method was designed to efficiently and continuously monitor NH 3 , independently of changes in the external environment. Overall, the catalytic conversion method of NH 3 into NO 2 increased the recognition of NH 3 and excluded most interfering gases. With the addition of differential processing , the detection results were further refined by eliminating the influence of oxidizing interfering gases, temperature, and humidity. This method can be applied in various demanding environments to obtain accurate results and eliminate the background interference that has long plagued sensor research.
研究领域:
环境科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2019
·
IF 1.859
Shanlin Li,Danmin Liu,Nan Tian,Yuntian Liang,Chunlang Gao,Shaobo Wang,Yongzhe Zhang
Detecting body temperature variation is highly crucial to monitor health conditions. Temperature sensors with good sensitivity can detect temperature through resistive changes. Among such sensors, silver nanowires (AgNWs) are one kind of important conductive fillers owing to the excellent conductivity and low cost. Here we introduce a facil strategy to construct AgNWs-based temperature sensors in terms of the effect of temperature and humidity on the resistance of AgNWs films. A linear relationship between the resistance and temperature was quantified. Moreover, the temperature sensitivity achieves ˜16 Ω/℃ over the range of 30–80 ℃, by combining polydimethylsiloxane (PDMS) films with AgNWs random network as the protective layer, which effectively controls the influence of humidity on the AgNWs. The integrated PDMS-AgNWs temperature sensor with a good reproducibility, opens an avenue for the potential applications of silver nanowires in other types of sensors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
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
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Teng-Long Zhou,En-Kang Wu,Jia-Kang Wu,Tian Qiang,Xiao-Feng Gu,Ming-Yang Yan,Svetlana von Gratowski,Jun-Ge Liang
Traditional microwave gas sensors have been widely used for gas detection at room temperature due to the advantages of high sensitivity and multi-parameter detection. However, the detection results can be significantly affected by the change of humidity, which restricts their application in practical environments. To solve this problem, a microwave gas sensor based on SnO 2 /Co 3 O 4 composite nanofibers, a micro-heater and a dual-mode resonator was proposed, achieving high-precision measurement of acetone within the range of 10~500 ppm. The integration of micro-heater can reduce water molecule adsorption, leading to enhanced sensing stability under varying humidity levels. The results demonstrate that the construction of SnO 2 /Co 3 O 4 heterostructures can enhance the sensitivity due to increasing charge transfer capability. The maximum sensitivity reached 3.938 mdB/ppm at the optimal operating temperature of 150 ℃, which is approximately five times higher than that of room temperature conditions. Moreover, the sensitivity of the microwave gas sensor maintains almost unchanged under different humidity, which can be attributed to the integration of micro-heater. This work provides a novel strategy for the design of microwave gas sensors in practical environments.
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
危险品化学品经营许可证（带存储）