期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 22, 期 46, 页码 27224-27240出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cp03328f
关键词
-
资金
- CSIR, New Delhi-India [09/079(2634)/2014-EMR-I]
Globular amorphous carbonaceous materials embedded with graphite encapsulated metallic Co-nanoparticles with a high degree of crystallinity are synthesized by pyrolysis and demonstrated as excellent candidates for optical limiters. The amount of metal precursor (Co-acetylacetonate) used with toluene for pyrolysis is chosen as a strategy to control the degree of graphitization of graphene-like shells around the embedded Co-nanoparticles and also the crystallinity of these Co nanoparticles in the samples. The graphitic shell with an optimum amount of defects tunes the electronic properties of these nanomaterials, providing the electronic states required for the enhancement of nonlinear optical absorption (NLA) through an excited state absorption (ESA) process. Simultaneously, the increase in the crystallinity of the Co nanoparticle enhances its metallic nature, which helps in increasing NLA performance through the free carrier absorption (FCA) process. The importance of highly metallic Co is to involve both the Co nanoparticle and its graphitic encapsulation in facilitating the FCA process, which substantially enhances NLA. In comparison with many similar samples (e.g., Fe3C@C at 100 mu J of laser energy), our present samples show superior NLA performance even at the much lower laser pulse energy of similar to 15 mu J. This performance is much better than many of the present-day NLA materials too. The simple, low-cost and one-step pyrolysis synthesis process makes our materials even more attractive.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据