ChemNanoMat
·
2020
·Vol. 6
·期 4
·589-597
·
IF 3.384
Guixian Zhu,Lin Cheng,Ruogu Qi,Xuewu Liu
Graphical Mesoporous ZIF-8 (PZIF-8) hollow microcages are prepared through synthetic wet-chemical etching by applying porous silicon microdisks (PSi) as hard templates. It is the property of ZIFs that promotes the formation of porous hollow structures on shells. On the basis of the mesoporous structure, the protein release behavior of PSi@PZIF-8 was investigated by applying BSA as a model protein. The results showed that ZIF-8 film can prolong protein release. Metal-organic frameworks (MOFs), with high crystalline and ordered pore structures, hold great potential for various applications. However, the small microporous structures of MOFs restrict their applications. MOFs with larger porous structure and dimensions can expand their functionality to integrate with other large active agents. By applying porous silicon microdisks (PSi) as hard templates, zeolitic imidazolate frameworks (ZIFs) were assembled on PSi to form PSi@ZIF-8 core-shell microdisks. A new porous structure of ZIF-8 microcages was obtained via a post-synthetic approach. The influence of PSi and reaction precursor for ZIF-8 were explored, and the formation mechanism of mesoporous ZIF-8 (PZIF-8) hollow microcages was also proposed. By applying bovine serum albumin (BSA) as a loading agent, the protein release behavior of PSi@PZIF-8 was investigated. It is noted that prepared PZIF-8 microcages could serve as new vectors for loading active agents.
研究领域:
材料科学
·
生物医学工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2021
·
IF 17.789
Linlin Ma,Li-Juan Yu,Jingchong Liu,Ya-Qiong Su,Shuai Li,Xiaohuan Zang,Tao Meng,Shuaihua Zhang,Jianjun Song,Jiangyan Wang,Xiaoxian Zhao,Zhimin Cui,Nü Wang,Yong Zhao
As the desired sulfur host of lithium-sulfur battery, the strong polarity and fast electron migration capability are indispensable for achieving effective adsorption and conversion of lithium polysulfides (LiPSs), that is, restricting the shuttle effect. Herein a porous microdisk Ti 4 O 7 /TiN/C heterojunction with strong polar N-Ti-O covalent bonds is precisely constructed. Compared with O-Ti-O or N-Ti-N bond in single Ti 4 O 7 or TiN , the N-Ti-O bond with stronger polarity could adsorb and bond with S and Li atoms in LiPSs, which is beneficial for LiPSs adsorption. Beside, the Ti 4 O 7 /TiN heterostructure favors the electron transfer , which could promote the conversion of LiPSs. The design strategy is to construct abundant polar N-Ti-O bonds at Ti 4 O 7 /TiN heterogeneous interface that would realize the associative process of LiPSs adsorption, trapping, and conversion, thereby restraining the shuttle effect efficiently. In the current study, as the host of the sulfur cathode, the porous microdisk TiN/Ti 4 O 7 /C heterojunction exhibits a high specific capacity of 1204.5 mAh g −1 at 0.2 C, and a high specific capacity of 616.5 mAh g −1 at an ultrahigh current density of 4 C. In addition, 86.4% and 116.9% capacity are retained over 1000 cycles at 1 C and 2 C, respectively. This strategy provides an insight into developing lithium-sulfur battery with extraordinary performance, and opens promising routes to design the next-generation electrochemical energy storage devices.
研究领域:
材料科学
·
电化学能源存储
✓ 已验证
DOI
高影响因子
Chemosensors
·
2024
·Vol. 12
·期 3
·43
·
IF 3.7
Yi Li,Boyu Zhang,Juan Li,Zaihua Duan,Yajie Yang,Zhen Yuan,Yadong Jiang,Huiling Tai
The NH3sensor is of great significance in preventing NH3leakage and ensuring life safety. In this work, the Pd-decorated ZnO hexagonal microdiscs are synthesized using hydrothermal and annealing processes, and the gas sensor is fabricated based on Pd-decorated ZnO hexagonal microdiscs. The gas-sensing test results show that the Pd-ZnO gas sensor has a good response to NH3gas. Specifically, it has a good linear response within 0.5–50 ppm NH3at the optimal operating temperature of 230 °C. In addition, the Pd-ZnO gas sensor exhibits good repeatability, short response time (23.2 s) and good humidity resistance (10–90% relative humidity). This work provides a useful reference for developing an NH3sensor.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Wei Gao,Shanshan Han,Boyang Wang,Zeyu Sun,Yanrui Lu,Qingyan Han,Xuewen Yan,Jihong Liu,Jun Dong
Harnessing the precious metal plasmon effect is a powerful way to enhance the upconversion luminescence of rare-earth materials, so it has received extensive attention from researchers. In this study, a series of AMF@SiO 2 @NaYbF 4 : Er 3+ composite structures were constructed with an Au mono-layer film (AMF) as the substrates and SiO 2 as the isolation layer to enhance the upconversion emission intensity of a single NaYbF 4 : 2%Er 3+ microdisk. When the size of Au nanoparticles was 72 nm and the thickness of the SiO 2 isolation layer was 24 nm, the upconversion emission enhancement factor of the single NaYbF 4 : 2%Er 3+ microdisk reached 6.98 under 980 nm laser excitation, due mainly to the enhancement of the local electromagnetic field. The upconversion luminescence properties of a single NaYbF 4 : 2%Er 3+ microdisk were significantly affected by the size of Au nanoparticles, the density of the AMF substrate, and the thickness of the SiO 2 isolation layer. The plasmon-enhanced upconversion luminescence mechanism was studied according to its luminescence properties, dynamic tests, and theoretical simulation. The synergistic effects in the local electromagnetic field, luminescence quenching, and local surface plasmon resonance effect are also discussed. The results of this research provide an invaluable theoretical basis for enhancing the upconversion luminescence of rare-earth materials with the help of AMF substrates.
研究领域:
材料科学
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光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2020
·Vol. 16
·期 26
·2000239
·
IF 11.459
Zhihe Guo,Yingchun Qin,Peizong Chen,Jinliang Hu,Yi Zhou,Xuyang Zhao,Zhiran Liu,Yiyan Fei,Xiaoshun Jiang,Xiang Wu
Whispering gallery mode (WGM) microresonators have been used as optical sensors in fundamental research and practical applications. The majority of WGM sensors are passive resonators that require complex systems, thereby limiting their practicality. Active resonators enable the remote excitation and collection of WGM-modulated fluorescence spectra, without requiring complex systems, and can be used as alternatives to passive microresonators. This paper demonstrates an active microresonator, which is a microdisk laser in a hyperboloid-drum (HD) shape. The HD microdisk lasers are a combination of a rhodamine B-doped photoresist and a silica microdisk. These HD microdisk lasers can be utilized for the detection of label-free biomolecules. The biomolecule concentration can be as low as 1 ag mL −1 , whereas the theoretical detection limit of the biosensor for human IgG in phosphate buffer saline is 9 ag mL −1 (0.06 a M ). Additionally, the biosensors are able to detect biomolecules in an artificial serum, with a theoretical detection limit of 9 ag mL −1 (0.06 a M ). These results are approximately four orders of magnitude more sensitive than those for the typical active WGM biosensors. The proposed HD microdisk laser biosensors show enormous detection potential for biomarkers in protein secretions or body fluids.
研究领域:
生物医学工程
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光学传感
·
分子诊断
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Junjun Wang,Peng Lin,Weiyang Yu,Peng Xu,Bowen Zhang,Guohua Cao
Pt-loaded curling-like Bi 2 WO 6 (BWO) microdiscs were fabricated via a simple one-step hydrothermal and impregnation route. Various characterization methods, such as XRD, EDS and TEM, were conducted to prove the successful Pt loading. Electron migration from the semiconductor BWO to the precious metal Pt was revealed by the blue shift of the Bi 4f and W 4f XPS peaks with the increase of the Pt loading amount and the ∼10-fold baseline resistance elevation of the BWO-based sensor by the Pt loading, proving the formation of Schottky junction. Among the pristine BWO and Pt-loaded BWO with different Pt loading amounts, 1 wt % Pt-loaded BWO exhibits the highest gas response of 209 in sensing 500 ppm triethylamine at 300 °C, a minimal selectivity coefficient of 130.6 against some typical interfering gases at the same concentration and a low detection threshold of 1 ppm. Additionally, the sensitization mechanism is discussed as the synergistic effect of noble metal catalytic effect and metal-semiconductor junctions.
研究领域:
材料科学
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化学传感器
·
纳米技术
✓ 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）