Photosensitive ZnO-Graphene Quantum Dot Hybrid Nanocomposite for Optoelectronic Applications

Abstract

Inorganic-organic hybrid nanostructures consisting of graphene as the organic part are being explored for various applications. Graphene quantum dots (GQDs) have gained popularity among other semiconductor quantum dots due to their distinct and interesting properties. Here, we have studied various properties of the electrodeposited hybrid nanocomposite consisting of ZnO and graphene-QDs (ZnO_GQD) along with the electrodeposited ZnO and GQDs individual films. It is observed that although GQDs do not change the properties of ZnO, but its addition shifts the PL peak of ZnO and also introduces some interesting changes in other electrical and optical characteristics. The values of photosensitivity of ZnO, GQD, and ZnO_GQD nanocomposite were found to be 6.77, 51, and 99.32, respectively at room temperature. The enhancement of photosensitivity of ZnO_GQD nanocomposite was 1.9-fold and 14.67-fold as compared to that of GQDs and ZnO, respectively. Owing to the convenience and cost-effectiveness of the current deposition technique, these nanohybrids can be grown onto different substrates to improve the characteristics of the ZnO_ GQD nanocomposites. The enhanced photosensitivity of the nanohybrids can hold immense potential for the application in UV-Vis optoelectronic devices.[a] Aaryashree , P.

Liquid Cybernetic Systems: The Fourth‐Order Cybernetics

“…Writing the memory will require the use of photoactive materials, i.e., bacteriorhodopsin, azopolymers, tectomers, liquid crystals, or combinations of inorganic/organic elements, such as graphene quantum dots and ZnO NPs. [ 73 ] The principle at the basis of writing is that the interference between the laser pattern projected onto the holonomic memory (carrying phase‐coded information) and the active molecules will locally induce photocarriers and initiate a change of steric configuration in reason of a certain amount of energy transferred by the laser beam at a proper frequency. Another approach to volume holographic memories was developed using bacteriorhodopsin, a biological protein isolated from Halobacterium salinarum , that is responsible for photosynthetic activity and trans‐membrane potential, and features extreme ruggedness, making it suitable for real applications.…”

Synergetic Accrual of Lamellar Nanohybrids for Band-Selective Photodetection

“…Electrochemical syntheses were carried out in 24 mL solutions (1:1 (v / v) DMSO/H 2 O) of 0.02 M Zn­(NO) 3 ·6H 2 O (Aldrich, 98%) with 2.0 mg of organic surfactant using a three-electrode setup (Autolab potentiostat) with a Pt counter electrode and an Ag/AgCl reference electrode . Water is required for reduction of NO –3 to generate OH – , and DMSO is added for surfactant solubility.…”

“…AUTOLAB, a computerized potentiostat, was employed to perform the potentiostatic deposition. For the deposition of ZnO, the aqueous solution contained 0.2 M zinc nitrate hexahydrate (Zn­(NO 3 ) 2 ·6H 2 O) dissolved in DI water . The electrolyte was stirred constantly throughout the deposition and kept at a temperature of 80 °C (±2 °C) for 1 h at a potential of −0.9 V.…”

Zinc Oxide Sensitized Graphene Quantum Dots “ZnO‐GQDs”: A Hybrid Concept to Study Charge Transfer and its Catalytic Applicability to Synthesize Tetrasubstituted Propargylamines

“…Recently, hybrid nano-composite materials based on "GQD-ZnO (organic-inorganic nano materials)" have stretch out as promising candidates in areas of solar cells, pollutant detection, super-capacitors, gas sensors, optoelectronic devices, and antimicrobial activity. [2,[15][16][17][18][19] However, to the best of our knowledge limited research has been done on the colloidal hybrid composite based on ZnO-GQDs nano structure. GQD itself has not been well studied and the brimming prospective of this material has not yet been comprehended.…”

“…From last few decades, efforts has been focused on organic‐inorganic hybrid nano‐composite that shows characteristics of both organic and inorganic constituents i. e. a hybridized concept within a single material to enhance the performance of nanomaterials for diverse applications. Recently, hybrid nano‐composite materials based on “GQD‐ZnO (organic‐inorganic nano materials)” have stretch out as promising candidates in areas of solar cells, pollutant detection, super‐capacitors, gas sensors, optoelectronic devices, and antimicrobial activity [2,15–19] . However, to the best of our knowledge limited research has been done on the colloidal hybrid composite based on ZnO‐GQDs nano structure.…”