Zinc oxide nanoparticle decorated multi-walled carbon nanotubes and their optical properties

Chen, C.S.; Chen, X.H.; Yi, Bin; Liu, T.G.; Li, W.H.; Xu, Lida; Yang, Zihui; Zhang, H.; Wang, Y.G.

doi:10.1016/j.actamat.2006.07.003

Cited by 86 publications

(54 citation statements)

References 29 publications

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“…Due to their great hardness and toughness, multiwall CNTs (MWCNTs) keep their morphology and structure even at high nanoparticle loadings [11]. It has been indicated that the CNTs' properties can be dramatically influenced by the surface modification with organic, inorganic and biological species [12][13][14]. Many metal oxides and sulfides such as TiO 2 , Cu 2 O, Al 2 O 3 , Co 3 O 4 , MgO, Fe x O y , ZnS and CdS have been used to modify the CNTs [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…It has been indicated that the CNTs' properties can be dramatically influenced by the surface modification with organic, inorganic and biological species [12][13][14]. Many metal oxides and sulfides such as TiO 2 , Cu 2 O, Al 2 O 3 , Co 3 O 4 , MgO, Fe x O y , ZnS and CdS have been used to modify the CNTs [12][13][14][15]. Zink oxide is a semiconductor material with an energy gap of 3.37 eV and a large exciton binding energy (60 meV) at room temperature [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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The effect of concentration ratio and type of functional group on synthesis of CNT–ZnO hybrid nanomaterial by an in situ sol–gel process

Largani

Pasha

2016

Int Nano Lett

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In this research, MWCNT-ZnO hybrid nanomaterials were synthesized by a simple sol-gel process using Zn(CH 3 COO) 2 Á2H 2 O and functionalized MWCNT with carboxyl(COOH) and hydroxyl(OH) groups. Three different mass ratios of MWCNT:ZnO = 3:1, 1:1 and 1:3 were examined. The prepared nanomaterials were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and Fourier transform infrared spectroscopy (FTIR). Successful growth of MWCNT-ZnO hybrids for both COOH and OH functional groups and all the three mass ratios were obtained. The ZnO nanoparticles attached on the surfaces of CNTs have rather spherical shapes and hexagonal crystal structure. By increasing the concentration of ZnO, the number and average size of ZnO nanoparticles decorated the body of CNTs in hybrid structures increase. By increasing the ZnO precursor, the distribution of ZnO nanoparticles that appeared on the surface of CNTs becomes more uniform. The SEM observation beside EDX analysis revealed that at the same concentration ratio the amount of ZnO loading on the surface of MWCNT-COOH is more than MWCNT-OH. Moreover, the average size of ZnO nanoparticles attached on the surface of COOH functionalized CNTs is relatively smaller than that of OH functionalized ones.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of concentration ratio and type of functional group on synthesis of CNT–ZnO hybrid nanomaterial by an in situ sol–gel process

Largani

Pasha

2016

Int Nano Lett

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“…To date various attempts to attach quantum dots (semiconducting nanoparticles) to one-dimensional carbon nanotubes (i.e., single walled carbon nanotubes (SWNTs) and multi-walled carbon nanotubes (MWNTs)) have been reported due to their potential applications in electronics, optical and biomedical devices. [3][4][5][6][7][8] In order to attach quantum dots to carbon nanotubes, the hydrophobic surface of the tube should be modified by the introduction of chemical moieties. In the case of SWNTs, the commonly used oxidative method is known to be very effective for creating specific binding sites with regard to quantum dots, while this process gives rise to a substantial deterioration of the electrical and optical properties of SWNTs through the breaking of C=C double bonds.…”

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confidence: 99%

CdSe quantum dot-decorated double walled carbon nanotubes: The effect of chemical moieties

Kim

Muramatsu

Park

et al. 2008

Applied Physics Letters

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We report that fluorine atoms on the outer tubes of double walled carbon nanotubes (DWNTs) are more effective for nucleating and growing CdSe nanoparticles than oxygen-containing functional groups. The CdSe particles with an average size of 5-7 nm grow through infiltration into an interstitial space created by 4-5 thin bundled DWNTs. We envisage DWNTs will replace single and multi-walled carbon nanotubes in a wide range of applications because chemical moieties could be introduced selectively on the outer tubes while the optical and physical properties of the inner tubes remain almost unchanged.

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“…Several publications have demonstrated successful charge transfer between NPs and CNT [38][39][40][41][42]. Usually this attachment involves covalent functionalization of the nanotubes [43] or other harsh treatments [39], which degrades the optical and electrical properties of nanotubes [13,44]. Newer approaches functionalize nanotubes non-covalently in order to attach various types of nanoparticles to the tubes [45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Oxygen and light sensitive field-effect transistors based on ZnO nanoparticles attached to individual double-walled carbon nanotubes

et al. 2012

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The attachment of semiconducting nanoparticles to carbon nanotubes is one of the most challenging subjects in nanotechnology. Successful high coverage attachment and control over the charge transfer mechanism and photo-current generation opens a wide field of new applications such as highly effective solar cells and fibre-enhanced polymers. In this work we study the charge transfer in individual double-wall carbon nanotubes highly covered with uniform ZnO nanoparticles. The synthetic colloidal procedure was chosen to avoid long-chained ligands at the nanoparticle-nanotube interface. The resulting composite material was used as conductive channel in a field effect transistor device and the electrical photo-response was analysed under various conditions. By means of the transfer characteristics we could elucidate the mechanism of charge transfer from non-covalently attached semiconducting nanoparticles to carbon nanotubes. The role of positive charges remaining on the nanoparticles is discussed in terms of a gating effect.

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Zinc oxide nanoparticle decorated multi-walled carbon nanotubes and their optical properties

Cited by 86 publications

References 29 publications

The effect of concentration ratio and type of functional group on synthesis of CNT–ZnO hybrid nanomaterial by an in situ sol–gel process

The effect of concentration ratio and type of functional group on synthesis of CNT–ZnO hybrid nanomaterial by an in situ sol–gel process

CdSe quantum dot-decorated double walled carbon nanotubes: The effect of chemical moieties

Oxygen and light sensitive field-effect transistors based on ZnO nanoparticles attached to individual double-walled carbon nanotubes

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