Engineering tunable conductivity, p-n junction and light-harvesting semi-conductivity of graphene oxide by fixing reduction mood only

•Tunable conductivity in series of pristine rGO film in real circuit is observed.•rGO found from hydrazine vapor (rGOHV) show p-n junction behavior.•rGO found from hydrazine solution (rGOHS) show optimum conductivity.•Water splitting capacity of rGOHS and rGOHV are 2.3 and 3.7 μmol/hg, respectively....

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Bibliographic Details
Published in:	Journal of the Taiwan Institute of Chemical Engineers Vol. 120; pp. 325 - 335
Main Authors:	Karim, Mohammad Razaul, Uddin, Md. Nizam, Shaikh, Md. Aslam, Rahaman, Md. Shamim, Siddiquey, Iqbal Ahmed, Arafath, Md. Azharul, Islam, Md. Saidul, Hayami, Shinya, Alamry, Khalid A., Asiri, Abdullah M., Rahman, Mohammed M.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-03-2021
Subjects:	Light harvesting bandgap N-doping P-n junction Photocatalysis Reduced graphene oxide Tunable conductivity Light harvesting bandgap Reduced graphene oxide P-n junction N-doping Photocatalysis Tunable conductivity
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Summary:	•Tunable conductivity in series of pristine rGO film in real circuit is observed.•rGO found from hydrazine vapor (rGOHV) show p-n junction behavior.•rGO found from hydrazine solution (rGOHS) show optimum conductivity.•Water splitting capacity of rGOHS and rGOHV are 2.3 and 3.7 μmol/hg, respectively.•Respective methylene blue degradation capacity of rGOHS and rGOHV are 84 and 92%. Modulated electron conductivity (EC), p-n junction behavior and light-harvesting semiconductivity in reduced graphene oxide (rGO) is observed. Pristine graphene oxide (GO) film on borosilicate glass was reduced by ascorbic acid (AA), Glucose (GC), hydrogen iodide (HI), thiourea (TU), hydrazine solution (HS) and hydrazine vapor (HV) to obtain respective rGOAA, rGOGC, rGOHI, rGOTU, rGOHS and rGOHV films. The morphologies of the films were studied by SEM image and PXRD spectra. The functional groups were studied by IR, Raman and XPS spectra. Except rGOHV, the samples exhibited tunable electron conduction behavior (EC) following the trend as rGOHS (1.1 × 10−1 mA/V) > rGOTU (4.4 × 10−3 mA/V) > rGOGC (1.5 × 10−3 mA/V) > rGOHI (8.9 × 10−4 mA/V) > rGOAA (2.6 × 10−4 mA/V). However, rGOHV exhibited p-n junction behavior with the knee point at 0.66 and -0.62 V for the forward and reverse bias, respectively. rGOHS and rGOHV could exhibit photocatalytic activity due to the presence of doped N. The water-splitting efficiency of rGOHS and rGOHV are 2.38 and 3.75 μmol/hg, respectively, whereas respective dye degradation efficiencies are 84.16 and 92.48%. TGA data confirms that rGOHV sustains with some water adsorbing capacity that can aid the hydrodynamics. Further, the hydrodynamics within rGO film was confirmed from hydronium ion conductivity. [Display omitted]
ISSN:	1876-1070 1876-1089
DOI:	10.1016/j.jtice.2021.03.019