ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 27
·期 22
·1700653
·
IF 12.124
Jia Yan,Marco-Tulio F. Rodrigues,Zhilong Song,Hongping Li,Hui Xu,Huan Liu,Jingjie Wu,Yuanguo Xu,Yanhua Song,Yang Liu,Peng Yu,Wei Yang,Robert Vajtai,Huaming Li,Shouqi Yuan,Pulickel M. Ajayan
Many unique properties arise when the 3D stacking of layered materials is disrupted, originating nanostructures. Stabilization, and further reorganization of these individual layers into complex 3D structures, can be essential to allow these properties to persist in macroscopic systems. It is demonstrated that a simple hydrothermal process, assisted by ionic liquids (ILs), can convert bulk g-C 3 N 4 into a stable hydrogel. The gelation occurs through delamination of the layered structure, driven by particular interactions between the IL and the carbon nitride sheets, forming an amphiphilic foam-like network. This study employs spectroscopic and computational tools to unravel the gelation mechanism, and provides a rational approach toward the stabilization of 2D materials in hydrogels. The solution-processable hydrogels can also be used as building blocks of complex devices. Chemiresistive gas sensors employing g-C 3 N 4 3D hydrogels exhibit superior response at room temperature, enabling effective gas sensing under low power conditions.
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
RARE METALS
·
2025
·
IF 11
Zheng Zi-Chen,Liu Ke-Wei,Zhou Yi-Wen,Zhang Zi-Cong,Qin Yong-Bin,Luo Yi-Fan,Xu Kai-Chun,Guo Liang-Chao,Debliquy Marc,Bittencourt Carla,Zhang Chao
Bismuth-doped antimony tungstate (Bi-doped Sb 2 WO 6 ) microspheres were synthesized via a novel hydrothermal synthesis approach. These microspheres were then used as active layers in gas sensors for the detection of carbon dioxide (CO 2 ), a significant greenhouse gas and a critical parameter for evaluating air quality. The incorporation of bismuth significantly enhances the gas-sensing performance of the Sb 2 WO 6 microspheres, with the 4% Bi-doped sensing active layer achieving a remarkable response value of 15 when exposed to 200 ppm of CO 2 , outperforming the undoped Sb 2 WO 6 . Furthermore, the selectivity of the 4%Bi-Sb 2 WO 6 sensor toward CO 2 gas was enhanced relative to the Sb 2 WO 6 sensor. The fundamental mechanisms of gas sensing and the factors contributing to the improved CO 2 response of 4%Bi-Sb 2 WO 6 microspheres were investigated using density functional theory. Bi-doped Sb 2 WO 6 materials exhibit significant advantages in gas-sensing applications, including improved conductivity, enhanced gas adsorption capacity, increased reaction rates, good chemical stability, excellent selectivity, and the ability to adjust electron density. These characteristics enable Bi-doped Sb 2 WO 6 to demonstrate higher sensitivity and rapid response capabilities in gas sensors, making it suitable for practical applications. Graphical abstract
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Yun-Zhi Dai,Shu-Yu Liang,Chao Lv,Gong Wang,Hong Xia,Tong Zhang,Hong-Bo Sun
Micro/nanoscale gas sensors attracted more attention because of their potential application in the emerging areas such as electronic capsules, wearable devices, and microdrone detectors. However, it is still a challenge to achieve micro/nanoscale sensors with controllable processing parameters of active components and fast response and recovery capability. Here, a flexible and high precision femtosecond laser direct-writing technology is selected to print various semiconductor metal oxides nanoparticles into microscale designable patterns with mask-free. And by using Pd-doped WO 3 • x H 2 O nanoparticles we have fabricated single Pd-WO 3 • x H 2 O microwire (SPWM) as gas sensors, which represented high sensitivity, faster response and recovery. Especially, for ammonia gas sensing the SPWM with pre-designed lengths can possess ultrafast response with response/recovery time of 1.4/3.3 s in 50 ppm NH 3 , or low limit-of-detection of 1 ppm at room temperature. This kind of micro-scale gas sensor is expected to be applied to human health monitoring, environmental air detection and other integrated intelligent devices.
研究领域:
材料科学
·
传感器技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Lijia Zhao,Shupeng Sun,Su Zhang,Zhi Liu,Baoyu Huang,Nan Wang,Jianwei Zhang,Xiaogan Li
The hollow ZnO @ TiO 2 heterostructured nanospheres were synthesized by hydrothermal method using carbon nanospheres as sacrificed templates. With UV activation, the response of ZnO @ TiO 2 based chemiresistive-type sensors to 10 ppm formaldehyde is 11.02 at room temperature which is 5.48 times larger than that of the pure hollow ZnO. The response and recovery time significantly reduced to 14 s and 16 s. Selectivity, stability and repeatability of the hollow ZnO @ TiO 2 based sensor under UV-activation have also been examined. The sensing mechanism of the sensor to formaldehyde have been investigated by AC impedance spectroscopy , in-situ DRIFTS , and DFT theoretical calculation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Changkun Qiu,Hao Zhang,Qingrun Li,Yongxian Guo,Yifan Song,Fei An,Liang Zhu,Anshan Xiao,Chunxiao Lv,Dongzhi Zhang
The interface between two distinct materials in a heterojunction material plays a crucial role in gas sensors, as it facilitates the swift and effective transfer of charge carriers, resulting in enhanced response times. Nevertheless, the impact of heterogeneous interfaces on gas-sensing properties remains uncertain, impeding the advancement of semiconducting hybrids in gas-sensing applications. This study presents the synthesis of a PANI/CoMoO4 p–p heterogeneous nanocomposite through in situ polymerization of highly active PANI onto CoMoO4. In the range of 0.05–50 ppm NH3, PANI/CoMoO4 exhibits a rapid response time of ∼5 s (50 ppm) and a low LOD of 50 ppb. PANI/CoMoO4 has only 10% decrease in response to NH3 during 40 days and demonstrates a high selectivity to NH3 against H2S, CO, CH4, and other interferents. The effective modification of PANI, as confirmed by density functional theory (DFT), enhances the adsorption efficiency of NH3 molecules. Additionally, the p–p heterojunction interface between PANI and CoMoO4 facilitates efficient electron transport. The findings of this study highlight the advantages of p–p heterojunctions in NH3 detection, offering novel insights for the design and synthesis of high-performance gas-sensitive materials. Furthermore, effective utilization of the PANI/CoMoO4 nanocomposite in portable gas sensors and inspection robots underscores their practicality.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 7
·3843-3850
·
IF 2.047
Wang Q. Y.,Wu Z. F.,Zhang M.,Qin Z. J.,Wang L.,Zhong F. R.,Duan H. M.
To realize the resource utilization of waste mask fibers (MF), a layer of ZnS nanoparticles was grown on MF by a one-step hydrothermal method, and a MF/ZnS sensor was successfully prepared. This is the first time that resource utilization of MF has been combined with the development of a high-performance gas sensor. The MF/ZnS sensor showed high sensitivity and recoverability to target vapors at room temperature. Compared with ZnS powder loaded on a ceramic substrate, the MF/ZnS composite responses to four analytes have been improved by 8.4~35.2 times. In addition, the time for the MF/ZnS sensor to complete one response–recovery cycle for all four analytes was less than 30 s. This should be attributed to the high gas permeability of the MF substrate, which made the ZnS particles loaded on the MF more fully exposed to contact with the target vapors. This work not only provides a simple and low-cost method to optimize the sensing performance of gas sensors but also provides a new way for the resource utilization of MF. Graphic Abstract
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jundan Tang,Lihua Shen,Kunpeng Zhao,Jiaming Peng,Qili Chen,Chunxia Yu,Yuangang Li,Azhar Abbas,Shan Wang,Zhifang Liu
Nanomaterials-based gas sensors are conducive to online, real-time monitoring and large-scale production due to their simplicity, low energy consumption and miniaturization. Conventional nanomaterial-based (metal oxide semiconductor or two-dimensional nanomaterials) gas sensors are less sensitive (ppm-ppb level). So, it is significantly meaningful to develop new gas-sensing materials. Herein, Ag@sulfur nanosheets (S-NSs) nanocomposite-based sensor is explored for ultrasensitive detection of NH 3 in dry air at room temperature at parts per trillion (ppt) level. Introducing Ag nanoparticles (NPs) on S-NSs, improved electrical conductivity and created more effective adsorption sites, leading to a high response rate of 1.92 for 3 ppt NH 3 . The developed Ag@ S-NSs sensor showed a linear response to NH 3 in the range of 3–70 ppt with correlation coefficient of 0.996. Moreover, the developed Ag@S-NSs sensor showed fast response and recovery time (28/7 s) to NH 3 . The probable sensing mechanism is supposed that the polarization-induction of NH 3 changed of electronic energy level of Ag@S-NSs, and the changed energy is at approximately the same energy level of the Ag@S-NSs itself. Thus, a response signal caused by NH 3 with low concentration can also be felt by Ag@S-NSs sensing materials itself.
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
高影响因子
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
·
2020
·
IF 1.816
Kiran Abdullah,Xia Kong,Muhammad Imran,Ghulam Mustafa,Yanli Chen
A new hybrid material has been developed by mixing a sandwich-type double-decker, Eu[Pc(OC 4 H 9 ) 8 ] 2 = 2,3,9,10,16,17,23,24-octabutoxyphthalocyaninate] with acidified multiwalled carbon nanotubes (aMWCNTs) through non-covalent interactions. The UV-vis spectrum, X-ray diffraction and scanning electron microscope have been employed to reveal the J -aggregate mode and optimized morphology of Eu[Pc(OC 4 H 9 ) 8 ] 2 molecules in the Eu[Pc(OC 4 H 9 ) 8 ] 2 /aMWCNTs hybrid material. The gas-sensing devices based on this hybrid material are fabricated by a simple solvent-processing quasi-Langmuir–Shäfer (QLS) progress. The n -type and p -type response is shown by the Eu[Pc(OC 4 H 9 ) 8 ] 2 /aMWCNTs hybrid film at room temperature. The detection limit of the hybrid for ammonia and nitrogen dioxide gas is 0.5 ppm and 0.3 ppm, respectively.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Rui Gao,Lang Gao,Xianfa Zhang,Shan Gao,Yingming Xu,Xiaoli Cheng,Ghuanyu Guo,Qinghua Ye,Xin Zhou,Zoltán Major,Lihua Huo
ZnO@the reduced graphene oxide (rGO) nanorod arrays were grown in-situ on the ceramic tube substrate by one-step hydrothermal without any template or surfactant. The reduced graphene oxide was evenly coated around the ZnO nanorods through the controllable assembly of the rGO and ZnO heterojunction interface. rGO contributed to the improvement of material conductivity and provided more active sites to adsorb NO 2 molecules. The combination of rGO and ZnO significantly enhanced the response of the composite to NO 2 at room temperature . It showed an excellent selectivity to NO 2 and a good linear relationship in the concentration range of 0.1∼10 ppm. In order to explore the response mechanism of ZnO@rGO composite to NO 2 , the change of element composition and status was performed by XPS technology before and after the exposure of the composite to NO 2 . The gaseous products after the reaction were also tested by GC–MS technology. DFT calculations were performed based on the test results, which demonstrated that the p-n heterostructure produced by the ZnO@rGO composite had a beneficial effect on improving the gas response capability.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）