Nanostructure fabrication by using photoreactive nanoparticles and characterization of those

在脉冲532 nm激光照射下，十二硫醇(DT)包覆的金纳米颗粒(DT-Au)在有机溶剂中聚集并熔融。由于颗粒失稳，颗粒沉积在浸泡在胶体环己烷溶液中的玻璃衬底上。通常，金纳米颗粒的性质强烈地依赖于颗粒的表面条件。在本报告中，用1，6-己二硫醇(HD)分子取代了少量固定的DT分子，得到了以DT和HD为封端的金纳米颗粒，记为(DT+HD)-Au。通过元素分析确定(dt+hd)-Au中HD的含量为~6%。有趣的是，DT-Au和(DT+HD)-Au的吸收光谱表明，两种粒子在胶体溶液中具有相似的稳定性。尽管如此，这些金纳米粒子在激光照射后的活性却大不相同。当用(DT+HD)-Au代替DT-Au时，金纳米颗粒的生长和沉积速度加快，沉积的颗粒尺寸较大，达到数百纳米。

On irradiation with pulsed 532-nm laser light, dodecanethiol(DT)-capped gold nanoparticles (DT-Au) aggregate and fuse in organic solvents. As a result of particle destabilization, the particles are deposited onto a glass substrate immersed in a colloidal cyclohexane solution. Generally, the properties of gold nanoparticles depend strongly on the surface conditions of the particles. In this report, small amounts of immobilized DT molecules were replaced with 1,6-hexanedithiol (HD) molecules, giving gold nanoparticles capped with DT and HD, denoted as (DT+HD)-Au. The amount of HD in (DT+HD)-Au was determined to be 〜6% by elemental analysis. Interestingly, the absorption spectra of DT-Au and (DT+HD)-Au indicated that both particles have similar stabilities in colloidal solution. Despite this, the activities of these gold nanoparticles after laser irradiation differed dramatically. When (DT+HD)-Au was used instead of DT-Au, the degree of growth and deposition of gold nanoparticles was accelerated, and the deposited particles were huge, reaching sizes of several hundreds of nanometers.