Thermal-induced growth of gold nanoparticles conjugated with thermoresponsive polymer without chemical reduction.
Thermal-induced growth of gold nanoparticles conjugated with thermoresponsive polymer without chemical reduction.
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DOI：
10.1016/j.jcis.2011.03.078
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发表时间：
2011-07
影响因子：
9.9
通讯作者：
N. Uehara;Maki Fujita;Tokuo Shimizu
中科院分区：
文献类型：
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作者：
N. Uehara;Maki Fujita;Tokuo Shimizu
通过聚合物的相变破坏与金纳米粒子缀合的热响应聚合物，实现了金纳米粒子的生长，而无需金（III）离子的化学还原。当涂有热响应聚合物的金纳米颗粒溶液被加热时，热响应聚合物的链因脱水而被破坏，导致金纳米颗粒融合形成更大的纳米颗粒。 550 nm 附近消光带的演变证明了这些大型（融合后）金纳米颗粒的形成，并通过透射电子显微镜 (TEM) 和动态光散射 (DLS) 对其进行了表征。 TEM 图像证实了粒径为 80-100 nm 的大金纳米粒子的形成，而 DLS 表明存在流体动力学直径超过 200 nm 的大纳米粒子。沉积不需要添加还原剂或三价金离子来形成大的金纳米颗粒。研究了加热和溶液条件，以阐明大金纳米颗粒的形成机制。
The growth of gold nanoparticles without chemical reduction of gold (III) ions was achieved by the disruption of thermoresponsive polymers conjugated with the gold nanoparticles through the phase transition of the polymers. When a solution of gold nanoparticles coated with thermoresponsive polymers was heated, chains of the thermoresponsive polymers were disrupted because of dehydration, resulting in the fusion of gold nanoparticles to form larger nanoparticles. The evolution of the extinction band around 550 nm evidenced the formation of these large (post-fusion) gold nanoparticles, which were characterized by transmission electron microscope (TEM) and dynamic light scattering (DLS). TEM images verified the formation of the large gold nanoparticles having particle sizes of 80–100 nm, whereas DLS indicated the existence of large nanoparticles with hydrodynamic diameters exceeding 200 nm. The deposition did not require the addition of reductants or trivalent gold ions for the formation of the large gold nanoparticles. Both the heating and the solution conditions were studied to elucidate the mechanism of the formation of large gold nanoparticles.