Influence of dose on particle size and optical properties of colloidal platinum nanoparticles.
Influence of dose on particle size and optical properties of colloidal platinum nanoparticles.
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剂量对胶体铂纳米颗粒的粒径和光学特性的影响。
DOI：
10.3390/ijms131114723
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发表时间：
2012-11-12
影响因子：
5.6
通讯作者：
Saion E
中科院分区：
文献类型：
--
作者：
Gharibshahi E;Saion E
通过使用稳定的吸收光谱与各种基于化学的还原方法来生产胶体铂纳米颗粒的尝试通常导致吸收最大值的快速消失，留下还原的铂纳米颗粒，其光学性质的信息很少。我们在聚乙烯吡咯烷酮的水溶液中通过γ辐解还原法合成了胶体铂纳米颗粒，该方法产生了稳定的吸收光谱，完全还原和高纯度的铂纳米颗粒没有副产物杂质或还原剂污染。平均粒径被认为是在3.4-5.3 nm的范围内，并随着剂量的增加而减少，由于在通过γ辐射分解还原法形成金属纳米颗粒的过程中，成核作用占主导地位。铂纳米颗粒表现出具有两个吸收峰的光学吸收光谱，这两个吸收峰的中心在约216和264 nm处，并且随着颗粒尺寸的减小，峰蓝移到较低的波长。铂纳米颗粒的吸收光谱也计算使用量子力学处理，并一致地得到了良好的协议之间的计算和测量的吸收峰在不同的颗粒尺寸。这表明铂纳米颗粒的216和264-nm吸收峰可以认为分别源自（n = 5，l = 2）和（n = 6，l = 0）能态的传导电子向更高能态的带内跃迁。吸收能量，即，来自吸收峰的铂纳米颗粒的导带能量随着剂量的增加而增加，并且随着颗粒尺寸的增加而降低。
Attempts to produce colloidal platinum nanoparticles by using steady absorption spectra with various chemical-based reduction methods often resulted in the fast disappearance of the absorption maxima leaving reduced platinum nanoparticles with little information on their optical properties. We synthesized colloidal platinum nanoparticles in an aqueous solution of polyvinyl pyrrolidone by gamma radiolytic reduction method, which produced steady absorption spectra of fully reduced and highly pure platinum nanoparticles free from by-product impurities or reducing agent contamination. The average particle size was found to be in the range of 3.4–5.3 nm and decreased with increasing dose due to the domination of nucleation over ion association in the formation of metal nanoparticles by the gamma radiolytic reduction method. The platinum nanoparticles exhibit optical absorption spectra with two absorption peaks centered at about 216 and 264 nm and the peaks blue shifted to lower wavelengths with decreasing particle size. The absorption spectra of platinum nanoparticles were also calculated using quantum mechanical treatment and coincidently a good agreement was obtained between the calculated and measured absorption peaks at various particle sizes. This indicates that the 216 and 264-nm absorption peaks of platinum nanoparticles conceivably originated from the intra-band transitions of conduction electrons of (n = 5, l = 2) and (n = 6, l = 0) energy states respectively to higher energy states. The absorption energies, i.e., conduction band energies of platinum nanoparticles derived from the absorption peaks increased with increasing dose and decreased with increasing particle size.
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影响因子：
--
作者：
Gharibshahi, E.;Saion, E.
通讯作者：
Saion, E.
影响因子：
3.9
作者：
Harada, Masafumi;Okamoto, Koichi;Terazima, Masahide
通讯作者：
Terazima, Masahide
影响因子：
--
作者：
HENGLEIN, A;ERSHOV, BG;MALOW, M
通讯作者：
MALOW, M
影响因子：
5.8
作者：
Hikosaka, Keisuke;Kim, Juewon;Miyamoto, Yusei
通讯作者：
Miyamoto, Yusei
影响因子：
6.6
作者：
Jiang, San Ping;Liu, Zengcai;Pan, Mu
通讯作者：
Pan, Mu