Low-Thermal-Budget Doping of 2D Materials in Ambient Air Exemplified by Synthesis of Boron-Doped Reduced Graphene Oxideopen access
- Authors
- Cha, Jun-Hwe; Kim, Dong-Ha; Park, Cheolmin; Choi, Seon-Jin; Jang, Ji-Soo; Yang, Sang Yoon; Kim, Il-Doo; Choi, Sung-Yool
- Issue Date
- Apr-2020
- Publisher
- WILEY
- Keywords
- flash irradiation; gas sensors; graphene oxide; low-thermal-budget doping
- Citation
- ADVANCED SCIENCE, v.7, no.7, pp.1 - 11
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED SCIENCE
- Volume
- 7
- Number
- 7
- Start Page
- 1
- End Page
- 11
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1963
- DOI
- 10.1002/advs.201903318
- ISSN
- 2198-3844
- Abstract
- Graphene oxide (GO) doping and reduction allow for physicochemical property modification to suit practical application needs. Herein, the challenge of simultaneous low-thermal-budget heteroatom doping of GO and its reduction in ambient air is addressed through the synthesis of B-doped reduced GO (B@rGO) by flash irradiation of boric acid loaded onto a GO support with intense pulsed light (IPL). The effects of light power and number of shots on the in-depth sequential doping and reduction mechanisms are investigated by ex situ X-ray photoelectron spectroscopy and direct millisecond-scale temperature measurements (temperature >1600 degrees C, < 10-millisecond duration, ramping rate of 5.3 x 10(5) degrees C s(-1)). Single-flash IPL allows the large-scale synthesis of substantially doped B@rGO (approximate to 3.60 at% B) to be realized with a thermal budget 10(6)-fold lower than that of conventional thermal methods, and the prepared material with abundant B active sites is employed for highly sensitive and selective room-temperature NO2 sensing. Thus, this work showcases the great potential of optical annealing for millisecond-scale ultrafast reduction and heteroatom doping of GO in ambient air, which allows the tuning of multiple physicochemical GO properties.
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