Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 104, Issue -, Pages 233-242Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2017.01.027
Keywords
Pristine Graphene; Graphene nano-platelets; Defected graphene; Electron beam irradiation; Hydrophilicity; Photo-based electronic devices
Funding
- Yeungnam University Research Grant
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This paper reports an optimized electron beam irradiation (60 kGy and 90 kGy) approach for defects-related engineering of graphene nano-platelets for optical and structural properties dependent photoelectrochemical performances. The defects in the electron beam irradiated pristine graphene nano-platelets were studied, analyzed and confirmed using standard characterization techniques such as, diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), BrunauerEmmett-Teller (BET), high resolution-transmission electron microscopy (HR-TEM) and contact angle measurements. DRS clearly revealed the increment in the absorption band using electron beam irradiation doses of 60 kGy and 90 kGy. Contact angle measurements confirm the additional hydrophilic nature of the defects engineered graphene nano-platelets in comparison with pristine graphene. The photoelectrochemical performances such as linear sweep voltammetry and electrochemical impedance spectroscopy further confirms the enhancement in the optical, spectroscopic, and photoelectrochemical properties of the 90 kGy defected graphene in comparison to pristine graphene nano-platelets. Therefore, the proposed method is a reliable way of fine-tuning the properties (optical, spectroscopic and photoelectrochemical) of pristine graphene nano platelets using electron beam irradiation for enhanced photoelectrochemical performance.
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