Nanoparticles (NPs) of donor–acceptor organic semiconductors are produced by a one-step nanoprecipitation with Janus morphology. Electron donor P3HT was blended with electron acceptor PCBM in tetrahydrofuran and then precipitated in water, first with surfactant and second without surfactant. Cryogenic transmission electron microscopy reveals an internal Janus structure at high magnification, for NPs which have, in the past, been reported to have a molecularly intermixed morphology. Synchrotron-based scanning transmission X-ray microscopy confirmed the segregation of the organic semiconductors and photoluminescence experiments showed an efficient electron transfer from P3HT to PCBM. Organic field effect transistors were fabricated with these Janus NPs and showed that the positive charges can be efficiently transported through thin films. This behavior proves that the NPs possess an electron-accepting face (the PCBM face) able to transport electrons and a hole-accepting face (the P3HT face) for the conduction of holes. Finally, the deposition of silver the photoreduction of a silver salt (AgNO) was demonstrated, as a proof of concept. These experiments show the potential of the Janus NPs for photovoltaics but also photocatalytic reactions in which reduction and oxidation reactions can occur at opposite sides of the nanoreactor (the individual Janus NPs).

中文翻译：

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简单纳米沉淀法制备Janus有机半导体纳米颗粒


供体-受体有机半导体的纳米颗粒（NP）是通过具有 Janus 形态的一步纳米沉淀法制备的。将电子供体 P3HT 与电子受体 PCBM 在四氢呋喃中混合，然后在水中沉淀，首先使用表面活性剂，然后不使用表面活性剂。低温透射电子显微镜在高放大倍数下揭示了纳米颗粒的内部 Janus 结构，过去曾报道纳米颗粒具有分子混合形态。基于同步加速器的扫描透射 X 射线显微镜证实了有机半导体的分离，光致发光实验显示了从 P3HT 到 PCBM 的有效电子转移。用这些 Janus NP 制造了有机场效应晶体管，并表明正电荷可以通过薄膜有效传输。这种行为证明纳米粒子具有能够传输电子的电子接受面（PCBM面）和能够传导空穴的空穴接受面（P3HT面）。最后，演示了银盐（AgNO）的光还原银沉积，作为概念证明。这些实验显示了 Janus NP 在光伏发电以及光催化反应方面的潜力，其中还原和氧化反应可以在纳米反应器（单个 Janus NP）的相对侧发生。