期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 13, 期 9, 页码 4337-4348出版社
SPRINGER
DOI: 10.1007/s11051-011-0380-5
关键词
Gold nanorods; Chitosan; Gans theory; Photothermal conversion; Shape transformation; Modeling and simulation
资金
- Health Board of Tuscany
- FP7 NoE Photonics 4 Life
We investigate the photothermal conversion and transformation of gold nanoparticles with an initial dogbone shape after dispersion in hydrated chitosan films, which is a representative model of biological tissue, and excitation by a CW diode laser for 1 min. Gold nanodogbones are observed to undergo a distinct modification above a sharp threshold of similar to 11 W cm(-2) and 110 A degrees C. Surprisingly, the very same modification is achieved up to at least 36 W cm(-2) and 250 A degrees C. We use an analytical model derived from Gans theory to associate the change in color of the films with the change in shape statistics of these gold nanoparticles. This model proves both convenient and dependable. We interpret the photothermal transformation as a rearrangement of particles with a dogbone shape and an aspect ratio of 4.1 into rods with an aspect ratio of 2.5, where material from the end lobes of the dogbones may relocate to the waists of the rods. In turn, additional transitions to stable gold nanospheres may exhibit fairly slower kinetics.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据