Average Physical Enhancement by Nanomaterials under X-ray Irradiation

作者：Davidson R Andrew; Guo Ting^*

来源：Journal of Physical Chemistry C, 2014, 118(51): 30221-30228.

DOI：10.1021/jp509471m

We for the first time used highly water-soluble silica-covered gold nanoparticles (AuNP@SiO2) in water to successfully isolate average physical enhancement from other enhancements such as nanoscale physical enhancement, chemical enhancement, and antienhancement and obtained the highest enhancement slope of 1.03 per weight percent (wp(-1)) and the highest experimental enhancement factor of 4.5-fold (epsilon(expt) = 4.5 and epsilon(expt)= 0 for no enhancement) at 7.5 wp of gold in water. The slope and epsilon(expt) agree with the theoretically predicted values obtained from simulation of enhancement of X-rays by gold nanoparticles in water, and the experimental enhancement coefficient (? = epsilon(expt)/epsilon(theo), 0 <= gamma <= 1) is approximately 0.90. The enhancement dependency on X-ray energy, silica layer thickness, and sample thickness were studied experimentally and theoretically. The results presented here elucidate the mechanism of the average physical enhancement by nanomaterials under X-ray irradiation.

• 出版日期2014-12-25