Coating the gold nanorod with mesoporous silica is one of the recommended modification strategies for application of gold nanorod, and is valuable in studying the mechanism of nanoheterostructure formation. Focus on the thickness control strategy of silica coating layer, this study firstly investigated the specific effect of single experimental factor including tetraethoxysilane, gold nanorod, cetyltrimethylammonium bromide (CTAB), and hydroxide ion. Result shows that not only a limited thickness control range of 3.5 to 26 nm was acquired, but a reverse trend of the thickness change was exhibited for different factors, indicating both a synergetic and a competitive effect of these factors in the three stages of silica coating process. Based on this understanding, a new strategy was proposed by simultaneously controlling multiple experimental factors, and an increased silica thickness of around 42 nm was obtained. Therefore, a comprehensive understanding of the role of a specific factor in each stage of the coating process is proposed. According to this study, not only a better strategy for the thickness control of mesoporous silica coating layer is acquired, but a much clear picture of the three-stage mechanism of silica coating mechanism is received.

用介孔二氧化硅涂覆金纳米棒是金纳米棒应用的推荐改性策略之一，对于研究纳米异质结构的形成机制具有重要意义。本研究针对二氧化硅涂层的厚度控制策略，首先研究了四乙氧基硅烷、金纳米棒、十六烷基三甲基溴化铵（CTAB）和氢氧根离子等单一实验因素的具体影响。结果表明，不仅获得了3.5~26nm的有限厚度控制范围，而且不同因素的厚度变化呈现出相反的趋势，表明这些因素在二氧化硅涂层的三个阶段中既有协同作用，也有竞争作用。过程。基于这样的理解，通过同时控制多个实验因素提出了一种新策略，并获得了大约 42 nm 的增加的二氧化硅厚度。因此，建议全面了解特定因素在涂层过程的每个阶段的作用。根据这项研究，不仅获得了更好的介孔二氧化硅涂层厚度控制策略，而且对二氧化硅涂层机理的三阶段机理有了更清晰的了解。