Abstract We report a reversible top-down method to prepare nanoscale hybrid organic-inorganic perovskites (HOIPs) by employing a simple desolvation treatment on bulk counterparts. In the newly synthesized bulk HOIPs [C4H12N2]MBr3·H2O (M = K, Rb), the water molecules and hydrogen bonding in the frameworks can be efficiently removed which lead to HOIP nano-crystals with uniform morphology. Interestingly, these desolvated nanoscale HOIPs can recover back to their original phases upon subsequent exposure to moisture for two days. In addition, the mechanism of desolvation was disclosed by first principles calculations, which demonstrate the desolvation induced substantial mechanical difference in the parent and delsovated structures are responsible for the nanoparticulation. Our research provides an alternative top-down method for preparing HOIP nanomaterials in addition to the widely utilized bottom-up strategy.

中文翻译：

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通过去溶剂化将混合有机 - 无机钙钛矿从块状转变为纳米级

摘要 我们报告了一种可逆的自上而下的方法，通过对大量对应物采用简单的去溶剂化处理来制备纳米级混合有机-无机钙钛矿（HOIP）。在新合成的块状 HOIPs [C4H12N2]MBr3·H2O (M = K, Rb) 中，框架中的水分子和氢键可以被有效去除，从而导致 HOIP 纳米晶体具有均匀的形态。有趣的是，这些去溶剂化的纳米级 HOIP 在随后暴露于潮湿环境中两天后可以恢复到其原始状态。此外，通过第一性原理计算揭示了去溶剂化的机制，这证明去溶剂化在母体和去溶剂化结构中引起显着的机械差异是纳米颗粒化的原因。