A simple technique of seed-mediated growth has been successfully performed to grow anisotropy gold nanoparticles on solid substrates. The growth of the gold nanoparticles has been carried out in the presence of a binary surfactant mixture of hexadecyltrimethylammonium bromide with two different molecular weights of a capping agent, namely polyvinylpyrrolidone: 40,000 and 55,000. In this study, the effect of process parameters, growth time and molecular weight of capping agent was investigated. The growth time shows a significant impact on the shape and size of nanoparticles. The shorter growth time produced small spherical to square-like shape particles, whereas bigger particles including nanorods, nanosquares and nanotriangles were formed with longer growth time. The shape controlling agent, polyvinylpyrrolidone, was used to synthesis gold nanoparticles. It was found that monodisperse gold nanoparticles with uniform shape and size are hardly obtained when polyvinylpyrrolidone 40,000 was used as capping agent. Polyvinylpyrrolidone 55,000 produced more uniform shape and size of gold nanoparticles. Thus, these process parameters were found affected to the size, shape, surface density and uniformity of gold nanoparticles. This sample was further applied as a sensing material in the detection of toxic fungicide, namely chlorothalonil. The sensitivity of the sensor system was determined by the changes in peak positions and intensities of the transverse and longitudinal surface plasmon resonance peaks on different medium, that is, air, deionized water and chlorothalonil solution. The sensor response of gold nanoparticles thin film in 30 mM chlorothalonil showed two resonance peaks in comparison to the control experiment without gold nanoparticle thin film. The gold nanoparticles thin film sensor was successfully synthesized and potentially useful as a sensing material for fungicide detection.

中文翻译：

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在氧化铟锡基底上形成各向异性金纳米粒子作为等离子体传感材料

一种简单的种子介导生长技术已成功地用于在固体基质上生长各向异性金纳米粒子。金纳米粒子的生长是在十六烷基三甲基溴化铵与两种不同分子量的封端剂（即聚乙烯吡咯烷酮：40,000 和 55,000）的二元表面活性剂混合物存在下进行的。在这项研究中，研究了工艺参数、生长时间和封端剂分子量的影响。生长时间对纳米颗粒的形状和尺寸有显着影响。较短的生长时间产生较小的球形至方形颗粒，而较大的颗粒，包括纳米棒、纳米正方形和纳米三角形，随着生长时间的延长而形成。形状控制剂，聚乙烯吡咯烷酮，用于合成金纳米粒子。发现当聚乙烯吡咯烷酮40,000用作封端剂时，很难获得形状和尺寸均一的单分散金纳米粒子。聚乙烯吡咯烷酮 55,000 产生了形状和尺寸更均匀的金纳米粒子。因此，发现这些工艺参数会影响金纳米颗粒的尺寸、形状、表面密度和均匀性。该样品进一步用作检测有毒杀菌剂百菌清的传感材料。传感器系统的灵敏度由不同介质（即空气、去离子水和百菌清溶液）上横向和纵向表面等离子体共振峰的峰位和强度的变化决定。与没有金纳米颗粒薄膜的对照实验相比，30 mM 百菌清中金纳米颗粒薄膜的传感器响应显示出两个共振峰。金纳米颗粒薄膜传感器已成功合成，并可能用作杀菌剂检测的传感材料。