Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Gold nanoparticle ensembles as heaters and actuators: melting and collective plasmon resonances | Nanoscale Res Lett 2006 1 84-90 DOI 10.1007 s11671-006-9015-7 NANO EXPRESS Gold nanoparticle ensembles as heaters and actuators melting and collective plasmon resonances Alexander O. Govorov Wei Zhang Timur Skeini Hugh Richardson Jaebeom Lee Nicholas A. Kotov Published online 26 July 2006 to the authors 2006 Abstract We describe the peculiar conditions under which optically driven gold nanoparticles NPs can significantly increase temperature or even melt a surrounding matrix. The heating and melting processes occur under light illumination and involve the plasmon resonance. For the matrix we consider water ice and polymer. Melting and heating the matrix becomes possible if a nanoparticle size is large enough. Significant enhancement of the heating effect can appear in ensembles of NPs due to an increase of a volume of metal and electric-field amplification. Keywords Metal nanoparticles Heat generation Plasmons There has been a great deal of interest in recent years in the development of biosensors and actuators based on metal and semiconductor nanoparticles NPs . Metal NPs can efficiently quench 1 or enhance 2 photoluminescence from attached quantum emitters. The latter has been demonstrated for bio-conjugates composed of Au NPs linker molecules and semiconductor nanocrystals. Metal gold NPs have useful thermal properties. Under optical illumination Au NPs efficiently create heat 3-8 . The heating A. O. Govorov El W. Zhang T. Skeini H. Richardson Department of Physics and Astronomy Ohio University Athens OH 45701 USA e-mail govorov@ohiou.edu J. Lee N. A. Kotov Department of Chemical Engineering Department of Materials Science and Engineering and Department of Biomedical Engineering University of Michigan Ann Arbor MI 48109 USA effect becomes especially strong under the plasmon resonance conditions when the energy of incident photons is close to the plasmon frequency of an Au NP. In recent papers the heating effect in Au NPs was used for several purposes. The paper
