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Title: Low temperature synthesis of graphene-encapsulated copper nanoparticles from kraft lignin

Source: Materials Letters. 185: 131-134.

Author(s)Leng, Weiqi ; Barnes, H. Michael; Yan, Qiangu ; Cai, Zhiyong ; Zhang, Jilei

Publication Year: 2016  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4706-2B

Abstract: The formation of graphene-encapsulated copper nanoparticles was investigated through carbonizing a mixture of kraft lignin and copper sulfate pentahydrate at the temperature up to 500 °C. The abrupt conversion of copper ions into its atoms occurred at 300 °C. The formation of graphene layers surrounding copper nanoparticles started as early as the heating temperature reached 400 °C. Most copper nanoparticles were covered with less than five graphene layers when the temperature reached 500 °C. The average diameter of graphene-encapsulated copper nanoparticles was 12.75 and 11.62 nm for temperature at 400 and 500 °C, respectively. The heating temperature had no significant effect on the size of graphene-encapsulated copper nanoparticles in the evaluated temperature range. It is believed that the formation of graphene-layered shell surrounding copper nanoparticles is based on the mechanism of self-limiting theory with solid carbon as the carbon source.

Keywords: Forming process; mechanism; graphene encapsulated copper; nanoparticles

Publication Review Process: Formally Refereed

File size: 1,024 kb(s)

Date posted: 02/22/2019

This publication is also viewable on Treesearch:  view
RITS Product ID: 93580
Current FPL Scientist associated with this product
Cai, Zhiyong
Supervisory Research Materials Engineer
  

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