Sun Yugang, Xia Younan
Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA.
Analyst. 2003 Jun;128(6):686-91. doi: 10.1039/b212437h.
This paper presents several solution-phase methods for the large-scale synthesis of metal nanoparticles with controllable compositions (e.g., spherical nanoparticles of gold/silver alloys), morphologies (e.g., nanospheres, triangular nanoplates, circular nanodisks, and nanocubes of silver), and structures (e.g., solid vs. hollow colloids). Spectral measurements indicated that the positions of surface plasmon resonance (SPR) bands for these nanoparticles could be tuned by varying all these parameters. The number of SPR peaks was found to increase as the symmetry of the nanoparticles decreased. In addition to their use as chromophores with strong extinction coefficients, these nanoparticles could serve as a platform to probe binding events of chemical and biochemical species on their surfaces. Gold nanoshells with hollow interiors were, in particular, shown to exhibit a much higher sensitivity to environmental changes than gold solid colloids with roughly the same size.
本文介绍了几种用于大规模合成具有可控组成（例如金/银合金球形纳米颗粒）、形态（例如银的纳米球、三角形纳米片、圆形纳米盘和纳米立方体）和结构（例如实心与空心胶体）的金属纳米颗粒的溶液相方法。光谱测量表明，通过改变所有这些参数，可以调节这些纳米颗粒的表面等离子体共振（SPR）带的位置。发现SPR峰的数量随着纳米颗粒对称性的降低而增加。除了用作具有强消光系数的发色团外，这些纳米颗粒还可以作为一个平台来探测化学和生物化学物质在其表面上的结合事件。特别是，内部中空的金纳米壳比尺寸大致相同的实心金胶体对环境变化表现出更高的灵敏度。
