Nanoscale photocurrent distribution in ultra-thin films of zinc oxide nanoparticles and their hybrid with reduced graphene oxide

Madhuri, K. Priya; Bramhaiah, K.; John, Neena S.

doi:10.1088/2053-1591/3/3/035004

Cited by 7 publications

(4 citation statements)

References 29 publications

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“…For rGO-ZnO nanocomposite, the 2

values were observed at 21.54°, 31.48°, 34.21°, 36.08°, 47.54°, 56.53°, 62.78°, 67.92°, and 69.36° corresponding to (002), (100), (101), (002), (102), (110), (103), (112), and (201) planes, respectively. These diffractions are associated to the hexagonal structure similar to the wurtzite (JCPDS 79-2205) [ 27 ]. The absence of diffraction peak at 10.92° in GO-ZnO infers that GO is reduced to rGO after hydrothermal treatment.…”

Section: Resultsmentioning

confidence: 99%

Adsorption and Kinetics Studies of Cr (VI) by Graphene Oxide and Reduced Graphene Oxide-Zinc Oxide Nanocomposite

et al. 2022

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In this work, graphene oxide (GO) and its reduced graphene oxide-zinc oxide nanocomposite (rGO-ZnO) was used for the removal of Cr (VI) from aqueous medium. By employing a variety of characterization techniques, morphological and structural properties of the adsorbents were determined. The adsorption study was done by varying concentration, temperature, pH, time, and amount of adsorbent. The results obtained confirmed that rGO-ZnO is a more economical and promising adsorbent for removing Cr (VI) as compared to GO. Kinetic study was also performed, which suggested that sorption of Cr (VI) follows the pseudo-first-order model. For equilibrium study, non-linear Langmuir was found a better fitted model than its linearized form. The maximum adsorption capacity calculated for GO and rGO-ZnO nanocomposite were 19.49 mg/g and 25.45 mg/g, respectively. Endothermic and spontaneous nature of adsorption was detected with positive values of ΔS (change in entropy), which reflects the structural changes happening at the liquid/solid interface.

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“…For rGO-ZnO nanocomposite, the 2

Section: Resultsmentioning

confidence: 99%

Adsorption and Kinetics Studies of Cr (VI) by Graphene Oxide and Reduced Graphene Oxide-Zinc Oxide Nanocomposite

et al. 2022

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“…Hence, characterization of these materials on the nanoscale is of prime importance in understanding the film morphology and the local heterogeneity in conductance in relation to the locally varying surface features. For this, conducting atomic force microscopy (C-AFM) is a reliable diagnostic tool in the field of nanoelectronics for probing the local conductive domains of the materials under study and charge-transfer properties. − …”

Section: Introductionmentioning

confidence: 99%

Nanoscale Conductance in Lead Phthalocyanine Thin Films: Influence of Molecular Packing and Humidity

Madhuri

Kaur²,

Ali³

et al. 2017

J. Phys. Chem. C

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The influence of crystalline phase and disorder on vertical charge transport in nonplanar metallophthalocyanines is studied by depositing thin films of shuttlecock molecules, lead phthalocyanine (PbPc), and SnPc on various substrates such as highly oriented pyrolytic graphite (HOPG), silicon, and gold and investigating the structural and electrical characteristics of the films. The films represent three cases of crystalline packing such as monoclinic, triclinic, and disordered phases, directed by the substrate−molecule interactions and intermolecular interactions. Theoretical calculations are performed to understand the molecular orientations on the substrate and give insights into the possible origin of ordered and disordered packing. Vertical charge transport in the films is studied by employing conducting atomic force microscopy and compared with bulk electrical measurements. It is revealed that the monoclinic phase of PbPc on HOPG exhibits two orders of magnitude higher conductance than silicon or gold and is related to the ordered stacking of the macrocycles through which the charge transport is facilitated. Local conductance mapping reveals inhomogeneity among conducting domains and is correlated with the grain structure. The charge transport is best fitted with tunneling mechanism for nanoscale and space-charge-limited current for bulk measurements. The presence of humidity is also shown to influence the nanoscale charge transport with enhanced conductance. Under saturating humidity conditions, the conductance is found to decrease. This study emphasizes the implication of graphite or graphite-like platforms that promote the ordered stacking of delocalized molecular systems for enhanced vertical charge transport.

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“…Various hybrid nanocomposites based on ZnO and rGO have been explored in the field of photodetectors, gas sensors, batteries, supercapacitors, and many more due to their enhanced properties [9][10][11][12][13][14]. Previously, it has been widely reported about the charge transport properties of ZnO and rGO materials individually and their nanocomposites with other different materials (eg.…”

Section: Introductionmentioning

confidence: 99%

Investigation of charge transport mechanism in hydrothermally synthesized reduced graphene oxide (rGO) incorporated zinc oxide (ZnO) nanocomposite films

Jain

Sharma

Puri

2021

J Mater Sci: Mater Electron

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The present study aims to investigate the impact of reduced graphene oxide (rGO) incorporation on the charge transport properties of zinc oxide (ZnO) nanocomposite films. ZnO and varied weight percentage of rGO (1.25% to 10%) in ZnO-rGO nanocomposites are synthesized via cost-effective and facile hydrothermal method. The effect of varying weight percentage of rGO in ZnO nanocomposite is analysed by techniques such as X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive X-ray (EDX), Fourier transform infra-red spectroscopy (FTIR), and Raman spectroscopy. The observed current-voltage (I-V) characteristics at room temperature show the enhancement in forward current with an increasing weight percentage of rGO (1.25% to 10%) in ZnO nanocomposite films. To study the charge transport mechanism in nanocomposite films, dual-logarithmic I-V characteristics are plotted. From the characteristic curves, we find that three different laws of space charge limited conduction (SCLC) model namely Ohm's law, Child's law, and trap-limited SCLC mechanism describe charge transport properties in the ZnO-rGO nanocomposite films. At a low weight percentage of rGO (1.25%) in ZnO-rGO nanocomposite films, a transition from Child's law to trap-limited SCLC mechanism (0.9 V being the cross-over voltage) is obtained. As the weight percentage of rGO in ZnO-rGO nanocomposite films is increased from 2.5 to 10%, the conduction is favored by Ohm's law at low applied voltages to Child's law at higher applied voltages. Best experimental results are shown with 5% of rGO in ZnO-rGO nanocomposite. The prepared nanocomposite films have potential applications in UV-photodetector devices.

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Nanoscale photocurrent distribution in ultra-thin films of zinc oxide nanoparticles and their hybrid with reduced graphene oxide

Cited by 7 publications

References 29 publications

Adsorption and Kinetics Studies of Cr (VI) by Graphene Oxide and Reduced Graphene Oxide-Zinc Oxide Nanocomposite

Adsorption and Kinetics Studies of Cr (VI) by Graphene Oxide and Reduced Graphene Oxide-Zinc Oxide Nanocomposite

Nanoscale Conductance in Lead Phthalocyanine Thin Films: Influence of Molecular Packing and Humidity

Investigation of charge transport mechanism in hydrothermally synthesized reduced graphene oxide (rGO) incorporated zinc oxide (ZnO) nanocomposite films

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