单个银纳米颗粒及其化学环境的表征。

Characterization of individual ag nanoparticles and their chemical environment.

作者信息

Rajagopalachary Sidhartharaja, Verkhoturov Stanislav V, Schweikert Emile A

机构信息

Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012, USA.

出版信息

Anal Chem. 2009 Feb 1;81(3):1089-94. doi: 10.1021/ac802188c.

DOI:10.1021/ac802188c

PMID:19105605

Abstract

Silver nanoparticles (NPs) of approximately 5 nm diameter deposited in a single layer on glycine were examined with cluster secondary ion mass spectrometry (SIMS) in the event-by-event bombardment-detection mode. The projectiles used were Au(3)(+), C(60)(+), and Au(400)(4+) with impact energies of 34, 26, and 136 keV, respectively. The highest secondary ion yields were obtained with Au(400)(4+). The method presented can test single or multilayer organization and determine surface coverage. NPs are identified one-by-one for chemical composition. Chemical and physical information in a nonimaging mode was resolved at approximately 10 nm. Grazing vs direct impacts on NPs were identified and quantified. NP fragmentation from direct impacts with Au(400)(4+) and C(60)(+) was observed for the first time.

摘要

采用逐事件轰击-检测模式，利用团簇二次离子质谱（SIMS）对沉积在甘氨酸上的单层直径约为5nm的银纳米颗粒（NPs）进行了检测。所使用的入射离子分别为Au(3)(+)、C(60)(+)和Au(400)(4+)，其撞击能量分别为34keV、26keV和136keV。使用Au(400)(4+)时获得了最高的二次离子产率。所提出的方法可以测试单层或多层结构并确定表面覆盖率。逐个识别纳米颗粒的化学成分。在非成像模式下，约10nm的化学和物理信息得以分辨。识别并量化了对纳米颗粒的掠射与直接撞击。首次观察到Au(400)(4+)和C(60)(+)对纳米颗粒的直接撞击导致的纳米颗粒破碎。