Chou Cheng-Hsuan, Chen Cheng-Dah, Wang C R Chris
Department of Chemistry and Biochemistry, National Chung Cheng University, Min-Hsiung, Chia-Yi 621, Taiwan, Republic of China.
J Phys Chem B. 2005 Jun 9;109(22):11135-8. doi: 10.1021/jp0444520.
A photon-to-thermal energy conversion nanosystem based the near-infrared irradiation of one-dimensional gold nanoparticles (nanorods) is highly efficient and tunable to the incident wavelength. Using ambient photothermal detection, we observed a temperature rise of ca. 30 degrees C upon irradiating an aliquot of an aqueous nanoparticle suspension with a laser for 5 s. The temperature can be elevated even higher by embedding the particles into a poorly thermally conducting solid medium. The illuminated area of a sample containing nanorod particles embedded in a polyurethane matrix can be heated to >100 degrees C upon irradiation for 1 min. This optothermal conversion efficiency can be turned on selectively by tuning the wavelength to match that of the surface plasmon resonance of the particles. This specificity, with respect to the wavelength of the incident light, makes these highly efficient, particle-based, optothermal nanoconvertors suitable for potential use in multicolor detection on biochips and related sensors and as ideal contrasting agents for optoacoustic biomedical imaging applications.
基于一维金纳米颗粒（纳米棒）近红外辐射的光子 - 热能转换纳米系统高效且可根据入射波长进行调节。使用环境光热检测，在用激光照射纳米颗粒水悬浮液的一份试样5秒后，我们观察到温度升高约30摄氏度。通过将颗粒嵌入热导率差的固体介质中，温度可以升得更高。在照射1分钟后，嵌入聚氨酯基质中的含有纳米棒颗粒的样品的照射区域可被加热到>100摄氏度。通过调节波长以匹配颗粒的表面等离子体共振波长，可以选择性地开启这种光热转换效率。这种关于入射光波长的特异性使得这些高效的、基于颗粒的光热纳米转换器适用于生物芯片和相关传感器上的多色检测，并作为光声生物医学成像应用的理想对比剂。
