Heterogeneous Graphene Nanostructures: ZnO Nanostructures Grown on Large‐Area Graphene Layers

Lin, Jian; Penchev, Miroslav; Wang, Guoping; Paul, Rajib; Zhong, Jiebin; Jing, Xiaoye; Ozkan, Mihri; Ozkan, Cengiz S.

doi:10.1002/smll.201000250

Cited by 92 publications

(63 citation statements)

References 38 publications

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“…Moreover, growing oxides over graphene could provide additional functionality to graphene in electronic and optoelectronic applications. [ 25 ] The graphene used is chemical vapor deposition (CVD)-grown, and the growth process is discussed in the Supporting Information. We observed consistent growth of ZnO fl akes on graphene over Si substrate as presented in SEM pictures in Figure 3 a-d.…”

Section: Communicationmentioning

confidence: 99%

Controlled Synthesis of Single‐Crystalline ZnO Nanoflakes on Arbitrary Substrates at Ambient Conditions

Vabbina

Karabiyik

Al-Amin

et al. 2013

Part & Part Syst Charact

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www.particle-journal.com www.MaterialsViews.com COMMUNICATIONsubstrates for 2D morphology-controlled ZnO nanostructure growth. Graphene is a 2D carbon nanostructure, which has been studied extensively in recent years due its remarkable mechanical, optical, and electronic properties. [ 13 ] These properties makes graphene a promising candidate for many potential applications including electronic and optical devices. Graphene electrodes with nanostructures can also be applied as synergistic electrodes for different fl exible and transparent conducting devices. The growth mechanism of the synthesized 2D ZnO nanostructures is studied in detail with the help of scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and selected area electron diffraction (SAED). Based on the data, we believe that ZnO nanofl akes are oriented along (0001) plane and grow laterally along (0110) plane. Furthermore, the electrical and optical data show excellent conduction and transmission properties, respectively. Our synthesis method is a low-cost, low-temperature, scalable, and potentially high-throughput process, which can be further extended for the synthesis of wide range of other 2D materials for different applications in electronics and optoelectronics devices.We used zinc nitrate hexahydrate [ZNH; Zn(NO 3 )·6H 2 O] and hexamethylenetetramine [HMT; (CH 2 ) 6 ·N 4 ] (both from SigmaAldrich) for the sonochemical synthesis of ZnO nanofl akes. [ 12 ] ZNH provides Zn 2+ ions and H 2 O molecules in the solution provide O 2− ions. HMT has been used as a shape-inducing polymer in ZnO nanowire growth as polymer as it attaches to the nonpolar facets of ZnO cutting the supply of Zn 2+ ions, thus allowing the growth of ZnO in only <0001> direction. [ 14 ] However, the shape of the nanostructures strongly depends on the concentration of ZNH/HMT solutions, which affects the precipitation mechanism of the oxide. [ 15,16 ] It was observed that as the concentration of ZNH/HMT aqueous solution increased, the length of the ZnO nanorods decreased. [ 15 ] In the present case, the concentration of the precursors is increased by 10-20 times and the sonication amplitude is increased by 20% compared with the earlier process. [ 12 ] The process temperature does not exceed 70 ° C, as amplitude of the sonication is increased. At the higher concentrations used in this process and fast reaction rates achieved under sonication, HMT releases large amounts of OH − and NH 4 + ions in a short period of time. At this higher concentrations, precipitation of Zn 2+ ions occurs at faster rate than required for HMT-assisted oriented growth of ZnO nanostructures, [ 14,15 ] resulting in growth of nonpolar planes of ZnO along with polar (0001) plane forming parallelogram-shaped 2D ZnO nanofl akes.Figure 1 a,b shows the SEM pictures of the ZnO nanofl ake growth on Si substrate at 30 s and 1 min. 2D ZnO nanofl akes grow from sheet structures to hexagonal crystal structure, Semiconductor nanostructures have attracted considerable research i...

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Section: Communicationmentioning

confidence: 99%

Controlled Synthesis of Single‐Crystalline ZnO Nanoflakes on Arbitrary Substrates at Ambient Conditions

Vabbina

Karabiyik

Al-Amin

et al. 2013

Part & Part Syst Charact

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“…[1][2][3][4][5][6] The semiconductor nanostructures work as effi cient channels for carrier transport and electrical pumping to radiative recombination, thereby improving the device performances greatly in optoelectronics and electronics. Furthermore, the graphene layers, which have excellent electrical and thermal conductivity, high mechanical strength and elasticity, and/or optical transparency, act as novel substrates offering new functionalities such as transferability or fl exibility.…”

Section: Doi: 101002/adma201201966mentioning

confidence: 99%

Position‐ and Morphology‐Controlled ZnO Nanostructures Grown on Graphene Layers

et al. 2012

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“…So far, all ZnO nanocombs have been fabricated by using chemical vapor deposition (CVD) (Wang et al, 2003;Yan et al, 2003;Leung et al, 2004;Liu et al, 2004;Park et al, 2004;Xu et al, 2004;Liao et al, 2005;Pan et al, 2005;Huang et al, 2006;Lao et al, 2006;Lim et al, 2006;Shen et al, 2006;Xu et al, 2006;Zhang et al, 2006;Li et al, 2007;Song et al, 2007;Wang, 2007;Umar et al, 2008;Yang et al, 2008;Zha et al, 2008;Zhang et al, 2008;Kim et al, 2009;Lin et al, 2010;Chang et al, 2011;Choi et al, 2011;Kumar et al, 2011). Mostly used precursors in this process are Zn powders (Yan et al, 2003;Huang et al, 2006;Shen et al, 2006;Zhang et al, 2006;Li et al, 2007;Song et al, 2007;Umar et al, 2008), Zn foils (Zha et al, 2008), ZnO (Wang et al, 2003;Pan et al, 2005), and a mixture of ZnO and graphite powders (Leung et al, 2004;Park et al, 2004;Xu et al, 2004Xu et al, , 2006Lao et al...…”

Section: Introductionmentioning

confidence: 99%

Growth of Single-sided ZnO nanocombs/ML graphene Heterostructures

Al-Ruqeishi

Mohiuddin

2019

Arabian Journal of Chemistry

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We report catalyst-free growth of high-density single-sided ZnO nanocombs for the first time on a multi-layer graphene (MLG). Structural analysis based on scanning electron microscope reveals the nanocomb ribbon average diameter and length are about 90-600 nm and 5-60 lm, respectively, while the diameter and length of the comb tooth are about 30-100 nm and 100-700 nm respectively. In general, the length of the teeth decreases gradually from one end of the nanocomb ribbon to another. ZnO crystal growth seems to involve two steps which are the formation of Zn buffer layer/graphene, which works as growth nucleation sites and long nanowires ends with nanocombs structure. Raman and PL optical transitions prove the well-faceted hexagonal structure of ZnO nanocombs as well as the existence of defects such as O vacancies and Zn interstitials. Graphene-based inorganic hybrid nanostructures provide several potential applications in optoelectronics and nanoscale electronics such as nanogenerators, photovoltaic devices, optical devices, and photodetectors. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Heterogeneous Graphene Nanostructures: ZnO Nanostructures Grown on Large‐Area Graphene Layers

Cited by 92 publications

References 38 publications

Controlled Synthesis of Single‐Crystalline ZnO Nanoflakes on Arbitrary Substrates at Ambient Conditions

Controlled Synthesis of Single‐Crystalline ZnO Nanoflakes on Arbitrary Substrates at Ambient Conditions

Position‐ and Morphology‐Controlled ZnO Nanostructures Grown on Graphene Layers

Growth of Single-sided ZnO nanocombs/ML graphene Heterostructures

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