材料科学
聚乙烯吡咯烷酮
钙钛矿(结构)
喷墨打印
微尺度化学
纳米技术
纳米复合材料
原位
聚合物
墨水池
化学工程
复合材料
高分子化学
化学
有机化学
数学教育
工程类
数学
作者
Yang Liu,Fushan Li,Lichun Qiu,Kaiyu Yang,Qianqian Li,Xin Zheng,Hailong Hu,Tailiang Guo,Chaoxing Wu,Tae Whan Kim
出处
期刊:ACS Nano
[American Chemical Society]
日期:2019-02-12
被引量:62
标识
DOI:10.1021/acsnano.8b08582
摘要
Perovskite materials have exhibited promising potential for universal applications including backlighting, color conversion, and anticounterfeiting labels fabricated using solution processes. However, owing to the tendency of those materials to have uncontrollable morphologies and to form large crystals, they cannot be utilized in discontinuous microminiaturization, which is crucial for practical optoelectronic applications. In this research, combining the effects of adding polyvinylpyrrolidone (PVP), precisely controlling the inkjet printing technique, and using a postprocessing procedure, we were able to fabricate in situ crystallized perovskite-PVP nanocomposite microarrays with perfect morphologies. The viscosity of the perovskite precursor increased with the addition of PVP, eliminating the outward capillary flow that induces the coffee-ring effect. In addition, because of the presence of metallic bonds with the C═O groups in PVP and the spatial confinement of such a polymer, we were able to fabricate regulated CsPbBr3 nanocrystals capped with PVP and with a uniform size distribution. The as-printed patterns showed excellent homogeneity on a macroscale and high reproducibility on a microscale; furthermore, those patterns were invisible in the ambient environment, compatible with flexible substrates, and cost-efficient to produce, indicating that this technique holds promising potential for applications such as anticounterfeiting labels.
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