TY - JOUR
T1 - Defects and band gap shrinkage in ZnO/rGO composite nano-pebbles prepared by solid–state reaction
AU - Mangavati, Suraj
AU - Rao, Ashok
AU - Devadiga, Dheeraj
AU - Selvakumar, M.
AU - Misra, Kamakhya Prakash
AU - Upadhyaya, Aditi
AU - Chattopadhyay, Saikat
N1 - Funding Information:
One of the authors (SM) is thankful to Manipal Academy of Higher Education for providing Dr. T.M.A Pai scholarship to carry out the present work. The authors acknowledge Central Analytical Facility (CAF), Manipal University Jaipur (MUJ), India, for UV?Vis, PL and FTIR measurements. Sophisticated Analytical Instrumentation Facility (SAIF) of MUJ, India, for FESEM measurements, is also duly acknowledged.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/3
Y1 - 2022/3
N2 - In the present investigation, ZnO/rGO nanocomposites were prepared using conventional solid-state reaction method. Raman, XRD, FTIR, UV–Vis, PL and FESEM characterization tools were used to analyze the synthesized materials. Raman analysis reveals the formation of rGO with prominent D and G-band peaks. XRD patterns confirm the crystalline and hexagonal wurtzite structure with P63mc space group of all the samples. Rietveld refinement demonstrates the size variation (33 nm–56 nm) and strain profile. FESEM micrographs of ZnO/rGO composites have established the formation of densely packed hexagonal nano-pebbles. UV–Vis and room temperature PL measurements indicate that the optical properties of ZnO and ZnO/rGO nanocomposites are affected by the rGO concentration. It also confirms a band gap shrinkage during nanocomposite preparation compared to the pure ZnO structure. Urbach energy is found to increase with increase in rGO content and the strength of electron-phonon interaction enhances. It also affects the PL emission in the UV region. FTIR spectra confirm the presence of different functional groups. Present investigation shows that ZnO/rGO materials are potential candidates for design and development of sensors for detecting gases.
AB - In the present investigation, ZnO/rGO nanocomposites were prepared using conventional solid-state reaction method. Raman, XRD, FTIR, UV–Vis, PL and FESEM characterization tools were used to analyze the synthesized materials. Raman analysis reveals the formation of rGO with prominent D and G-band peaks. XRD patterns confirm the crystalline and hexagonal wurtzite structure with P63mc space group of all the samples. Rietveld refinement demonstrates the size variation (33 nm–56 nm) and strain profile. FESEM micrographs of ZnO/rGO composites have established the formation of densely packed hexagonal nano-pebbles. UV–Vis and room temperature PL measurements indicate that the optical properties of ZnO and ZnO/rGO nanocomposites are affected by the rGO concentration. It also confirms a band gap shrinkage during nanocomposite preparation compared to the pure ZnO structure. Urbach energy is found to increase with increase in rGO content and the strength of electron-phonon interaction enhances. It also affects the PL emission in the UV region. FTIR spectra confirm the presence of different functional groups. Present investigation shows that ZnO/rGO materials are potential candidates for design and development of sensors for detecting gases.
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U2 - 10.1016/j.diamond.2022.108886
DO - 10.1016/j.diamond.2022.108886
M3 - Article
AN - SCOPUS:85124310404
SN - 0925-9635
VL - 123
JO - Diamond and Related Materials
JF - Diamond and Related Materials
M1 - 108886
ER -