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首页> 外文期刊>Chemistry: A European journal >Alkylaminosilane-assisted simultaneous etching and growth route to synthesise metal nanoparticles encapsulated by silica nanorattles
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Alkylaminosilane-assisted simultaneous etching and growth route to synthesise metal nanoparticles encapsulated by silica nanorattles

机译：烷基氨基硅烷辅助的同时刻蚀和生长途径合成二氧化硅纳米nano囊包裹的金属纳米颗粒

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摘要

An efficient and facile method to synthesise silica nanorattles with multiple noble metal (Au and Pd) cores by a simultaneous etching and growth route has been developed. In this strategy, a dual-functional alkylaminosilane was adopted to form the middle layer of solid organic-inorganic hybrid solid-silica spheres (HSSSs), which enabled the selective etching of the middle hybrid layer of the HSSSs and the in situ growth of metal nanoparticles (NPs) inside the cavity in a one-step hydrothermal reaction. By adjusting the pH values of the reaction system, the metal NPs could be grown exclusively inside the silica nanorattles, resulting in a high atomic utilisation of the noble metals. The size and number of Au cores were tunable by manipulating the initial concentration of HAuCl_4. The prepared silica nanorattles with Au cores were successfully applied to the catalytic reduction of 4-nitrophenol and showed high catalytic activity and cycle stability. Catalysts with multiple gold cores exhibited superior catalytic activity to those with a single gold core, probably because they possess smaller Au cores with greater surface area. Shake, rattle and roll: A simultaneous etching and growth strategy to prepare metal cores in silica nanorattles (SNs; gold: GESN; palladium: PESN) is presented (see figure). This is done by introducing a dual-functional alkylaminosilane to construct an etchable middle layer and to provide a reducing agent for the in situ growth of metal nanoparticles. (HSSS=hybrid solid silica spheres.)
机译：已开发出一种有效且简便的方法，可通过同时蚀刻和生长途径合成具有多个贵金属（Au和Pd）核的二氧化硅纳米nano。在该策略中，采用双功能烷基氨基硅烷形成有机-无机杂化固体硅球（HSSS）的中间层，从而能够选择性蚀刻HSSS的杂化层和金属的原位生长一步水热反应在腔体内形成纳米颗粒（NPs）。通过调节反应系统的pH值，金属NP可以仅在二氧化硅纳米nano内部生长，从而导致贵金属的高原子利用率。通过控制HAuCl_4的初始浓度可以调节Au核的大小和数量。所制备的具有金核的二氧化硅纳米nano成功地用于催化4-硝基苯酚的还原反应，并具有较高的催化活性和循环稳定性。具有多个金核的催化剂表现出比具有单个金核的催化剂更高的催化活性，这可能是因为它们具有较小的Au核和较大的表面积。摇，摇铃和滚动：提出了一种同时蚀刻和生长的策略，用于在二氧化硅纳米nano（SN;金：GESN;钯：PESN）中制备金属核（见图）。通过引入双官能烷基氨基硅烷以构造可蚀刻的中间层并提供用于金属纳米粒子的原位生长的还原剂来完成此操作。 （HSSS =混合固态二氧化硅球。）

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