ACS Catalysis
·
2017
·
IF 10.614
Miaomiao Liu,Weiqiang Tang,Zhaohui Xie,Hongbo Yu,Hongfeng Yin,Yisheng Xu,Shuangliang Zhao,Shenghu Zhou
In this work, Pt-SnO2 heteroaggregate nanocatalysts were synthesized by in situ transformation of Pt@Sn core–shell nanoparticles and their catalytic performance for hydrogenation of various substituted nitroaromatics was investigated. The Pt@Sn nanoparticles were prepared by a one-step method, and the alumina-supported Pt@Sn nanoparticles were further transformed in situ into Pt-SnO2 heteroaggregate nanostructures by calcination. The structures of Pt@Sn and Pt-SnO2 nanomaterials were characterized, and FT-IR with CO probes, HRTEM, XRD, and XPS characterizations revealed that the as-synthesized Pt@Sn nanoparticles were core@shell-like structures with Sn-rich shells and Pt-rich cores and the obtained Pt-SnO2 heteroaggregate nanostructures consisted of close-contact pure Pt and SnO2 phases. The Pt-SnO2/Al2O3 nanostructures demonstrated a better catalytic performance for hydrogenation of various substituted nitroaromatics relative to individual Pt/Al2O3 nanocatalysts. Theoretical calculations suggested that Pt-SnO2 nanocatalysts can slightly facilitate the adsorption of H2 and o-chloronitrobenzene and strongly weaken the binding of Pt/o-chloroaniline, resulting in more available reactants and easier release of products from the catalyst surfaces. The theoretical calculations indicated that the enhanced catalytic performance may originate from a cooperative interaction between Pt and SnO2.
研究领域:
化学
·
催化科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Chemosensors
·
2023
·Vol. 11
·期 1
·31
·
IF 4.2
Xilai Lu,Menghan Wu,Yong Huang,Jiannan Song,Yong Liu,Zhiqiao Yan,Feng Chen,Jieting Zhao,Wanping Chen
The slight but cumulative influence of impurity gases in air poses a great threat to the long-term stability of room-temperature gas sensors. Room-temperature hydrogen-sensitive Pt–SnO2composite nanoceramics of 5 wt% Pt were prepared through pressing and sintering. The response of a sample was over 10,000 after being exposed to 500 ppm H2S–20% O2–N2at room temperature, and the room-temperature hydrogen sensing capacity was seriously degraded even for samples that had aged dozens of days since H2S exposure. Mild heat treatments such as 160 °C for 10 min were found able to fully activate those H2S-exposed samples. As the peak of S 2p electron was clearly detected in H2S-exposed samples, it was proposed that for room-temperature hydrogen-sensitive Pt–SnO2composite nanoceramics, H2S exposure induced degradation results from the poisoning of Pt by H2S deposited on it, which can be removed through a mild heat treatment. Periodic mild heat treatment should be a convenient and effective measure for room-temperature metal oxide gas sensors to achieve long-term stability through preventing the accumulation of impurity gases in air deposited on them.
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
Materials
·
2021
·Vol. 14
·期 9
·2123
·
IF 3.623
Ming Liu,Caochuang Wang,Pengcheng Li,Liang Cheng,Yongming Hu,Yao Xiong,Shishang Guo,Haoshuang Gu,Wanping Chen
Many low-dimensional nanostructured metal oxides (MOXs) with impressive room-temperature gas-sensing characteristics have been synthesized, yet transforming them into relatively robust bulk materials has been quite neglected. Pt-decorated SnO2nanoparticles with 0.25–2.5 wt% Pt were prepared, and highly attractive room-temperature hydrogen-sensing characteristics were observed for them all through pressing them into pellets. Some pressed pellets were further sintered over a wide temperature range of 600–1200 °C. Though the room-temperature hydrogen-sensing characteristics were greatly degraded in many samples after sintering, those samples with 0.25 wt% Pt and sintered at 800 °C exhibited impressive room-temperature hydrogen-sensing characteristics comparable to those of their counterparts of as-pressed pellets. The variation of room-temperature hydrogen-sensing characteristics among the samples was explained by the facts that the connectivity between SnO2grains increases with increasing sintering temperature, and Pt promotes oxidation of SnO2at high temperatures. These results clearly demonstrate that some low-dimensional MOX nanocrystals can be successfully transformed into bulk MOXs with improved robustness and comparable room-temperature gas-sensing characteristics.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2020
·Vol. 67
·期 8
·1431-1436
·
IF 1.554
Hsiang-Ning Luk,Tsai-Hsuan Dai,Ren-Jang Wu,Murthy Chavali
This proposed Pt@SnO 2 core-shell nanocomposite material based electrochemical sensor towards epinephrine detection showed high sensitivity, repeatability and high stability. It can play a significant role for precision determination of epinephrine in the drug sample and can also used for either simultaneous determination or others like acetaminophen (AC) and dopamine (DA) in samples.
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
·
2022
·Vol. 57
·期 32
·15267-15275
·
IF 4.682
Huang Yong,Chen Feng,Meng Lingyao,Hu Yongming,Chen Wanping
Room temperature gas-sensitive metal oxides have received growing concern over their long-term stability in recent years. Presently, Pt-SnO 2 composite nanoceramics of 1 wt% Pt have been prepared, and the time dependence of their room temperature hydrogen sensing capability has been carefully studied. A strong variation with time was observed, with the room temperature response to 1% H 2− 20% O 2 –N2 decreased by a factor of several dozen after only one week. Heat treatments were found highly effective to activate those aged samples. Their room temperature hydrogen sensing capability was almost completely restored through 10 min heat treatments at temperatures as low as 130 °C. It is proposed that impurity gases in air slowly deposit on Pt in Pt–SnO 2 composite nanoceramics, and the catalytic role of Pt is deactivated by the deposition and then activated after their desorption through heat treatments. These results suggest that periodic mild heat treatments can be a simple and feasible way for some room temperature gas-sensitive metal oxides to maintain a high long-term stability.
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
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xun Li,Heng He,Tian Tan,Zhihan Zou,Zhanyou Tian,Wanling Zhou,Yuwen Bao,Xiaohong Xia,Yun Gao
Low power consumption is a new emerged requirement for methane sensors long-term working in a gas supervisory control system. Great challenges remain in development of heat free methane sensors based on metal oxide semiconductors (MOS). In this work, Pt-doped SnO 2 (Pt-SnO 2 ) grow on well aligned ZnO nanorod-array to form an inter-staggered double-layer structure on AZO glass by a two-step hydrothermal method, with the annealing temperature being systematically studied. The optimized processing parameters are 1 at% Pt doping content and 700 °C annealing temperature, offering the best sensing response of 3.36 to 800 ppm CH 4 at room temperature. SnO 2 /ZnO without Pt doping shows linear I-V relationship, while the Pt-SnO 2 /ZnO shows a Schottky-like I-V curve with the Schottky barrier height decreases as increasing the CH 4 concentration. The activation energy (Δ E a ) for CH 4 dissociation decreases with increasing the annealing temperature, and the Δ E a of the optimized Pt-SnO 2 /ZnO sample is only one-third of that in the SnO 2 /ZnO. In addition to the piezoelectric polarization electric field in ZnO, the build up Schottky-like barrier and the reduced activation energy via Pt doping and annealing are demonstrated to be efficient for enhancing the methane sensing performance at low operation temperature.
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
·
2023
·
IF 8.4
Xinyue Li,Hongjing Fei,Yanlin Zhang,Zheng Zhang,Huakang Zong,Bo Liu,Guotao Duan,Yuanyuan Luo
The detection of low-concentration hydrogen at room temperature is still a challenge, which contributes to taking precautions as soon as possible when hydrogen leaks. In this study, we prepared Pt/SnO 2 -Pd nanomaterial as nanoelectrode applied for a fuel cell-type hydrogen sensor with zero power consumption . The sensing results show that such fuel cell-type H 2 gas sensor has high selectivity and good sensitivity to H 2 gas, with an unprecedented low detection limit of 1 ppm, and the humidity has little impact on the sensor's performance. Based on DFT calculations, the low adsorption energy and the electron transfer interaction between Pd and H promote the adsorption and dissociation processes of H 2 molecules, which lead to the hydrogen oxidation reaction acceleration and shorter times of response and recovery. In addition, this Pt/SnO 2 -Pd based sensor has also advantages of high selectivity and zero-power consumption, which may provide a broad application prospect for fuel cell vehicles and voltage transformers, etc.
研究领域:
材料科学
·
纳米技术
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Yunsong Wang,Nannan Zheng,Shujuan Liu,Shiping Yuan,Kai Li,Jinghuai Zhang,Yishan Gao,Liangcan He,Wei Cai,Shaoqin Liu
Triple-negative breast cancer (TNBC) exhibits strong radiotherapy resistance. A cascade system of Pt/SnO2–x@PDA@CaP-GOx initiated by X-rays was innovatively proposed first to enhance the radiotherapy sensitivity in terms of hypoxia-related radiotherapy resistance. By using the X-ray-responsive cascade system, not only the penetration depth could be ignored but also the advantages of radiotherapy could be effectively utilized. Through alleviating hypoxia and boosting reactive oxygen species (ROS) generation, excellent radiosensitivity could be achieved by the X-ray-responsive cascade enzymatic reaction system. Including H2O2 formation, O2 production, and ROS release, a series of explorations confirmed the formation of a complete X-ray-responsive cascade system. In vitro studies on 4T1 cells demonstrated that 81% killing rate could be achieved by the cascade system through DNA damage and HIF-1α regulation to alleviate hypoxia. The tumor proliferation was effectively inhibited, and its volume has reduced to 3% of the original solid tumor in the in situ transplantation tumor model. This work presents Pt/SnO2–x@PDA@CaP-GOx as a highly effective X-ray-responsive radiosensitizer, offering a promising strategy for TNBC radiotherapy.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiannan Song,Jieting Zhao,Zhao Wang,Yongming Hu,Wanping Chen
It is important for metal oxides to continuously uphold applicable room–temperature gas sensing capability for hundreds of days for practical applications. In this study, an exploration has been conducted to maintain an extraordinary room–temperature hydrogen sensing capability for 1 wt% Pt–SnO 2 composite nanoceramics over a prolonged time in a practical way. Though as–prepared samples’ room–temperature responses to hydrogen weakened obviously with time, they were completely restored through mild heat treatments like 200 °C for 15 min using commercial Al 2 O 3 ceramic heating plates of 10 mm × 10 mm. With such ceramic heating plates to provide a periodic heat treatment of 200 °C for 15 min in every three days, a room-temperature response over 1000 to 1 % H 2 –20 % O 2 –N 2 has been continuously maintained for samples over 365 days. It is suggested that some heaters should be incorporated into future room–temperature metal oxide gas sensors, whose periodic heat treatment will be crucial to maintain room–temperature gas sensing capability at minimum energy consumption for the sensors over their lifespan of service.
研究领域:
材料科学
·
气体传感技术
·
纳米材料
·
环境监测
·
能源存储与安全
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Renjun Si,Renminxi Ou,Jinbo Yang,Shaofeng Chen,Hongze Jiang,Xin Guo,Shunping Zhang
Drunk driving is a major threat to global traffic safety, accounting for 50% to 60% of traffic accidents. To address the bottleneck problem of insufficient selectivity of metal oxide gas sensors in drunk driving detection, this paper proposes an optimization strategy based on the principle of selective extraction and programmed temperature desorption technology. This strategy uses temperature modulation to control the adsorption processes of target gases, solving the cross-interference problem between ethanol and other volatile organic compounds in exhaled breath. A temperature-modulated on-chip programmed temperature desorption ethanol sensor was developed using ZSM-5 and Pt@SnO2 as the adsorption and desorption material and gas-sensitive material for ethanol, respectively. By optimizing the temperature modulation parameters (heating and cooling rates, adsorption time), the height of the ethanol desorption peak was precisely quantified. The maximum deviation of the desorption peak height of interfering gases and their mixtures with ethanol (40 ppm) in human exhaled breath from the detection instrument was only equivalent to 5.20 ppm ethanol. The highly selective ethanol sensor was integrated into the USB detection terminal to form a portable U-disk drunk driving detector, which has significantly better sensitivity and anti-interference ability than senior commercial products. The high selectivity is essentially due to the rapid extraction of ethanol from the environment by ZSM-5 in a short time.
研究领域:
传感器与生物传感器
·
微机电系统
·
气体检测技术
·
分析化学
·
交通安全
·
纳米材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganics
·
2023
·Vol. 11
·期 9
·366
·
IF 2.9
Jieting Zhao,Jiannan Song,Xilai Lu,Menghan Wu,Zhiqiao Yan,Feng Chen,Wanping Chen
Soluble noble metal salts are widely used for loading noble metals as nano-catalysts in many applications. In this paper, Pt-SnO2composite nanoceramics were prepared from SnO2nanoparticles and H2PtCl6using two Pt loading methods separately: for the solution reduction method, a H2PtCl6solution was added to a suspension of SnO2and zinc powder to form Pt on SnO2nanoparticles, and for the impregnation method, Pt was formed from H2PtCl6in the course of sintering. Although a series of samples prepared using both Pt loading methods showed a solid response to H2at room temperature, the ones prepared using the solution reduction method exhibited much better room-temperature hydrogen-sensing characteristics. For two samples of 0.5 wt% Pt and sintered at 825 °C, the response value for the sample prepared using the solution reduction method was 9700 to 1% H2–20% O2-N2, which was much larger than the value of 145 for the sample prepared using the impregnation method. Samples prepared using the two Pt loading methods have similar microstructures characterized via XRD, FESEM, EDS, TEM, and HRTEM. However, the residual chlorine content in those using the impregnation method was higher than those using the solution reduction method according to the analysis. It is proposed that the striking difference in room-temperature hydrogen sensing characteristics among samples prepared using these two different Pt loading methods separately resulted from their different chlorine removal processes. This study demonstrates the importance of a proper method for loading noble metals from their soluble salts as nano-catalysts in many applications.Keywords:SnO2;gas sensor;room temperature;Pt loading;catalyst
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 ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Shixin Zhang,Huanqiao Song,Tianjiao Li,Mingsheng Luo,Yu Chen,Changke Shao
Developing catalysts for the stable electrooxidation of ethanol have been a goal pursued by scientists. The present work reports a facile synthesis of catalysts with a double junction structure of Pt and SnO 2 on graphene (Pt/SnO 2 GN) through sol–gel combined with glycol hydrothermal reduction method. The physicochemical analyses show that the reduced Pt uniformly dispersed on GN is located adjacent to SnO 2 and has electronic interaction with the composite carrier. The electrochemical results exhibit that Pt/SnO 2 GN has better catalytic performance for ethanol electrooxidation than PtSnO 2 /GN and PtSn/GN. The ethanol oxidation peak current density on Pt/SnO 2 GN, after 1500 cycles of voltammetric testing, can still maintain 99.2% of the highest. The excellent catalytic stability of Pt/SnO 2 GN is ascribed to the double junction structure and the appropriate interaction between Pt and SnO 2 on GN, which enlarge the ECSA of Pt, improve the structural integrity, accelerate the charge transfer kinetics and increase the CO tolerance.
研究领域:
电化学
·
催化
·
材料科学
✓ 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）