Many biomedical applications can greatly benefit from the combination of photoluminescence and magnetic properties of non-toxic manganese-based nanomaterials and thus, it demands for synthesizing such materials in an aqueous environment. The present work reports aqueous synthesis of starch-capped manganese selenide (MnSe) nanoparticles (NPs) through a steady-state gamma irradiation route under ambient pressure and room temperature. As radiolysis is considered as the cleanest method among available chemical approaches, we preferred to employ this technique and endeavored to establish optimal conditions of such synthesis. The as-produced MnSe nanocrystals demonstrated strong photoluminescence with a quantum yield of ca. 32% and co-existence of paramagnetic with antiferromagnetic behavior. To look into possible light-induced reactions with aromatic molecules, the effectiveness of synthesized particles on photo-induced degradation of dyes of similar structure was investigated. The proposed strategy may pave the way for synthesizing magneto-fluorescent nanoparticles in aqueous medium, which may find immense scope in nano-photonics and nano-biotechnology including biological assays, labelling and imaging.

中文翻译：

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辐射驱动合成具有双发光和磁性特性的 MnSe 纳米颗粒及其在光催化反应中的作用


许多生物医学应用可以从无毒锰基纳米材料的光致发光和磁性的结合中受益匪浅，因此，它需要在水性环境中合成此类材料。本工作报道了在环境压力和室温下通过稳态伽马辐照途径水合成淀粉封端硒化锰 （MnSe） 纳米颗粒 （NPs）。由于放射分解被认为是可用化学方法中最干净的方法，我们更喜欢采用这种技术，并努力建立这种合成的最佳条件。产生的 MnSe 纳米晶体表现出强光致发光，量子产率约为 32%，并且顺磁性与反铁磁行为共存。为了研究与芳香族分子可能的光诱导反应，研究了合成颗粒对具有相似结构的染料的光诱导降解的有效性。所提出的策略可能为在水性介质中合成磁荧光纳米颗粒铺平道路，这可能在纳米光子学和纳米生物技术（包括生物测定、标记和成像）中找到巨大的应用范围。