Chemosensors
·
2025
·Vol. 13
·期 7
·239
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IF 3.7
Hongtao Wang,Yang Liu,Yuanchao Xie,Jianan Ma,Dan Han,Shengbo Sang
Mesoporous ZnO/ZnCo2O4nanocomposites with excellent gas-sensing performance were synthesized using the Ostwald ripening method. The as-prepared ZnO/ZnCo2O4comprised aggregated monodisperse nanoparticles, and the nanoparticle size grew with increasing thermal treatment temperature. Increasing the calcination temperature did not significantly change the overall size of the ZnO/ZnCo2O4nanocomposites, but the pore size and specific surface area were noticeably affected. The gas-sensing results showed that ZnO/ZnCo2O4composites calcined at 500 °C exhibited the highest response to H2S at 200 °C, with a detection limit of 500 ppb. The ZnO/ZnCo2O4composites also exhibited remarkable selectivity, response/recovery speed, and stability. Their excellent gas-sensing performance might be attributed to their porous structure, large specific surface area, and the heterogeneous interface between ZnO and ZnCo2O4. This work not only represents a new example of the Ostwald ripening-based formation of inorganic hollow structures in a template-free aqueous solution but also provides a novel and efficient sensing material for the detection of H2S gas.
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
ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 22
·期 8
·2000162
·
IF 3.217
Qingxiao Meng,Jianyong Feng,Huiting Huang,Xiaopeng Han,Zhi Zhu,Tao Yu,Zhaosheng Li,Zhigang Zou
Both phase and morphology of perovskite films are very important for high-performance optoelectronic devices. Although a two-step method based on CsBr ethylene glycol monomethylether (EGME) solution can prepare pure-phase CsPbBr 3 films, they have a poor morphology due to excessive Ostwald ripening. Herein, a bi-solvent engineering strategy is demonstrated to simultaneously optimize phase and morphology of CsPbBr 3 films in a two-step solution method, which uses the bi-solvents of EGME and isopropanol (IPA) instead of EGME for CsBr solution at the second step. Optimizing the volume ratio of bi-solvents and immersion time can control the Ostwald ripening effectively and result in pure-phase, compact, and smooth CsPbBr 3 films. Finally, the prepared films are applied to perovskite solar cells (PSCs) with a structure of fluorine-doped tin oxide (FTO)/compact TiO 2 (c-TiO 2 )/CsPbBr 3 /carbon. In comparison with EGME, the champion power conversion efficiency (PCE) of devices from EGME/IPA bi-solvents increases from 3.57% to 7.29% owing mainly to higher coverage, smoother surface, and lower trap density of CsPbBr 3 films from EGME/IPA bi-solvents. This work provides a simple and efficient method for the preparation of high-quality CsPbBr 3 films.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2019
·
IF 2.739
Shareen Shafique,Shuming Yang,Yonas Tesfaye Woldu,Yiming Wang
In this paper, we synthesized hierarchical urchin-like V 2 O 5 hollow spheres by simple, low cost and one-pot hydrothermal method without using any kind of templates and surfactants. The X-ray diffraction analysis indicated the urchin-like V 2 O 5 hollow spheres exhibited orthorhombic crystal structure. The field emission scanning electron microscope and high-resolution transmission electron microscope demonstrate that the morphology is urchin-like hollow spheres with an average diameter is about (3–4 μm). Time-dependent experiments were performed to investigate the plausible mechanism for the formation of hierarchical urchin-like V 2 O 5 hollow spheres through Ostwald ripening. And then, these urchin-like hollow spheres were used to fabricate the photodetector for the high-performance key parameters. The critical parameters such as photosensitivity, responsivity and specific detectivity were calculated 2.79 × 10 2 , 1.109 AW −1 , 1.525 × 10 11 Jones, respectively, under 41.3 mWcm -2 of 450 nm laser at an applied bias of −5 V. The urchin-like V 2 O 5 hollow spheres show excellent photodetection properties upon illumination, because of the cumulative effect of the primary building blocks of nanorods and proper hollow structure that enhance the resultant excellent device performance. Overall, this photodetector offers extraordinary potential and pave the way for an effective approach to fabricate next-generation optoelectronic and electronic devices.
研究领域:
材料科学
·
纳米技术
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光学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Liang Chai,Yiqun Wang,Zirui Jia,Zhixin Liu,Shiyi Zhou,Qinchuan He,Haiying Du,Guanglei Wu
Micromorphology of absorbent materials has always been one of the important parameters of microwave absorption performance. The adjustment of morphologic and structure can effectively enhance absorbing performance. In this work, hierarchical dandelion-like NiCo 2 O 4 (HDNCO) is prepared by solvothermal method and calcination. The effects of Ostwald ripening process on structure, morphology and absorbing performance are studied. The results indicate that structure and morphology of HDNCO have a significant effect on the absorption performance. Due to the special morphology and structure of HDNCO, the impedance matching can be improved. When Ostwald ripening process is 2 h, the reflection loss (RL) value reaches −45.08 dB at 2.1 mm, and the effective absorption bandwidth (EAB) is 3.06 GHz. Moreover, the EAB of HDNCO with Ostwald ripening time of 6 h reaches 3.68 GHz at only 1.0 mm and the EAB of HDNCO with Ostwald ripening time of 9 h is 5.78 GHz at 2.2 mm. The Ostwald ripening process changes the structure and morphology of HDNCO, which leads to improve the absorbing properties. Thus, this work has important guiding significance for the structural design of high-performance microwave absorber.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Hui-Ling Hu,Hao Hao,Xue Ren,Zhe-Yong Chen,Meng Liu,Yi Liu,Feng-Lei Jiang
InP quantum dots (QDs) attract growing interest in recent years, owing to their environmental advantages upon applications in display and lighting. However, compared to Cd-based QDs and Pb-based perovskites, the synthesis of InP QDs with high optical quality is relatively more difficult. Here, we established a mid-synthetic modification approach to improve the optical properties of InP-based QDs. Tris(dimethylamino)phosphine ((DMA)3P) and indium iodide were used to prepare InP QDs with a green emission (∼527 nm). By introducing zinc halides (ZnX2) during the mid-synthetic process, the photoluminescence quantum yield (PLQY) of the resulting InP/ZnSeS/ZnS core/shell/shell QDs was increased to >70%, and the full-width-at-half-maximum (FWHM) could be narrowed to ∼40 nm. Transmission electron microscopy clearly showed the improvement of the QDs particle size distribution after introducing ZnX2. It was speculated that ZnX2 was bound to the surface of QDs as a Z-type ligand, which not only passivated surface defects and suppressed the emission of defect states but also prevented Ostwald ripening. The InP cores were also activated by ZnX2, which made the growth of the ZnSeS shell more favorable. The photoluminescence properties started to be improved significantly only when the amount of ZnX2 exceeded 0.5 mmol. As the amount increased, more ZnX2 was distributed around the QDs to form a ligand layer, which prevented the shell precursor from crossing the ligand layer to the surface of the InP core, thus reducing the size of the InP/ZnSeS/ZnS QDs. This work revealed a new role of ZnX2 and found a method for InP QDs with high brightness and low FWHM by the mid-synthetic modification, which would inspire the synthesis of even better InP QDs.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2020
·
IF 7.053
Runan Zhao,Rong Song,Gege Sun,Shilin Liu,Bin Li,Yanping Cao,Yan Li
Essential oil-loaded emulsion is known to be unstable against Ostwald ripening. Hence, aiming to cut off this phenomenon, we fabricated eugenol-in-water emulsion by using co-stabilization method including interfacial layer formed by cinnamaldehyde/chitosan (CA-chitosan) and surfactant of glycerol monocaprylate (GMC). Oiling-off occurred in the emulsion with GMC as the sole stabilizer. While only white precipitates appeared in the CA-chitosan-stabilized emulsions due to the higher density of eugenol . In the presence of co-stabilizers, the particle size of emulsions showed unimodal distribution and kept almost constant within three months. Although there were some white precipitates in the emulsion after long-time storage, oil droplets still kept intact under optical microscopy. This result indicated that co-stabilizers could help to suppress the process of Ostwald ripening. The addition of polyvinyl alcohol effectively enhanced the stability of emulsions against gravitational separation. Eugenol emulsions kept stable even when eugenol content was up to 5 and 10 wt%. Antibacterial assay and time-kill experiment indicated that encapsulated eugenol had better antibacterial activity and long-term antibacterial efficiency, as compared to free eugenol. The obtained knowledge provides a novel technique to prepare eugenol-in-water emulsions, which has good long-term stability and antibacterial activity.
研究领域:
食品科学
·
化学工程
·
生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）