Behera Rakesh Kumar, Jagadish Koushik, Shyamal Sanjib, Pradhan Narayan
School of Materials Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India.
Materials Research Centre, Indian Institute of Science, Bangalore 560012, India.
Nano Lett. 2023 Sep 13;23(17):8050-8056. doi: 10.1021/acs.nanolett.3c01997. Epub 2023 Aug 30.
Designing heterostructures of soft ionic nanocrystals with metallic or covalent nanostructures having epitaxial junctions in solution poses several fundamental challenges. Hence, in spite of large successes in developing lead halide perovskite nanocrystals, the chemistry of formation of their facet-directive epitaxial growth of noble metals cannot be explored yet. To address this, herein, epitaxial heterostructures of orthorhombic CsPbBr and cubic Pt in multiple directional approaches are reported. Appropriate facets of perovskite nanocrystals and high-temperature reaction are the key parameters for obtaining such nanocrystal heterostructures. Interfacial planes at the junctions having ideal lattice matching helped in establishing the epitaxial relations of (110) of orthorhombic (space group ) CsPbBr with {020} of cubic Pt and again (011) of CsPbBr with {111} of Pt. These results provided strong fundamental insights that ionic halide perovskite nanostructures and materials having different crystal phases can be placed in a single building block with continuous sublattice structures.
在溶液中设计具有外延结的金属或共价纳米结构的软离子纳米晶体异质结构面临着几个基本挑战。因此，尽管在开发卤化铅钙钛矿纳米晶体方面取得了巨大成功，但尚未探索其与贵金属的面定向外延生长的形成化学。为了解决这个问题，本文报道了正交晶系CsPbBr和立方Pt在多种定向方法中的外延异质结构。钙钛矿纳米晶体的合适晶面和高温反应是获得此类纳米晶体异质结构的关键参数。具有理想晶格匹配的结处的界面平面有助于建立正交晶系（空间群）CsPbBr的(110)与立方Pt的{020}以及CsPbBr的(011)与Pt的{111}之间的外延关系。这些结果提供了强有力的基本见解，即离子卤化物钙钛矿纳米结构和具有不同晶相的材料可以放置在具有连续亚晶格结构的单个构建块中。
