Seedless growth of zinc oxide flower-shaped structures on multilayer graphene by electrochemical deposition

Aziz, Nur Suhaili Abd; Nishiyama, Taihei; Rusli, Nurul Izni; Mahmood, Mohamad Rusop; Yasui, Kanji; Hashim, Abdul Manaf

doi:10.1186/1556-276x-9-337

Cited by 26 publications

(26 citation statements)

References 45 publications

(54 reference statements)

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“…This methodology has been successfully reproduced using other metals, metal oxides, and semiconducting materials such as Au [275], Co 3 O 4 [276], ZnO [277], MnO [278], CdSe [279], and V 2 O 5 [280]. With other two-dimensional structure promoting templates, such as graphene or carbon nanotubes, unusual two-dimensional nanostructures such as Mn nanoflowers [281], ZnO nanoflowers [282], and Co 3 O 4 nanoflakes [283] can also be produced through electrodeposition.…”

Section: Electrodepositionmentioning

confidence: 99%

Template-based syntheses for shape controlled nanostructures

Pérez-Page

et al. 2016

Advances in Colloid and Interface Science

116

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A variety of nanostructured materials are produced through template-based synthesis methods, including zerodimensional, one-dimensional, and two-dimensional structures. These span different forms such as nanoparticles, nanowires, nanotubes, nanoflakes, and nanosheets. Many physical characteristics of these materials such as the shape and size can be finely controlled through template selection and as a result, their properties as well. Reviewed here are several examples of these nanomaterials, with emphasis specifically on the templates and synthesis routes used to produce the final nanostructures. In the first section, the templates have been discussed while in the second section, their corresponding synthesis methods have been briefly reviewed, and lastly in the third section, applications of the materials themselves are highlighted. Some examples of the templates frequently encountered are organic structure directing agents, surfactants, polymers, carbon frameworks, colloidal sol-gels, inorganic frameworks, and nanoporous membranes. Synthesis methods that adopt these templates include emulsion-based routes and template-filling approaches, such as self-assembly, electrodeposition, electroless deposition, vapor deposition, and other methods including layer-by-layer and lithography. Templatebased synthesized nanomaterials are frequently encountered in select fields such as solar energy, thermoelectric materials, catalysis, biomedical applications, and magnetowetting of surfaces.

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Section: Electrodepositionmentioning

confidence: 99%

Template-based syntheses for shape controlled nanostructures

Pérez-Page

et al. 2016

Advances in Colloid and Interface Science

116

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“…Li et al reported on the synthesis of ZnO nanoparticles on Si substrates with and without an Au catalyst [16]. Recently, we report the growth of ZnO nanostructures on seed/ catalyst-free substrates by introducing graphene as the template layer using both electrochemical and hydrothermal processes [14,23,26]. Up to date, there is no report on the formation of a ZnO continuous film structure on a ZnO-seeded substrate using liquid-phase methods.…”

Section: Introductionmentioning

confidence: 97%

“…Liquid-phase techniques such as hydrothermal and electrochemical processes have been widely used to grow ZnO structures on ZnO-seeded substrates [7,11,17,[19][20][21], catalyzed substrates [22], or seed/catalyst-free substrates [14,19,21,23]. Generally, the grown ZnO structures on the ZnO-seeded substrates are mostly in the form of onedimensional (1D) nanostructures [7,9,20,21,24,25] due to the nature of chemical reaction of liquid-phase techniques and also due to the small grains and rough surfaces of ZnO seed layers prepared by the sputtering method [7,20,21] or other deposition techniques [9,24,25].…”

Section: Introductionmentioning

confidence: 99%

High electron mobility and low carrier concentration of hydrothermally grown ZnO thin films on seeded a-plane sapphire at low temperature

Jayah¹,

Yahaya²,

Mahmood³

et al. 2016

Nano Online

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Hydrothermal zinc oxide (ZnO) thick films were successfully grown on the chemical vapor deposition (CVD)-grown thick ZnO seed layers on a-plane sapphire substrates using the aqueous solution of zinc nitrate dehydrate (Zn(NO 3 ) 2 ). The use of the CVD ZnO seed layers with the flat surfaces seems to be a key technique for obtaining thick films instead of vertically aligned nanostructures as reported in many literatures. All the hydrothermal ZnO layers showed the large grains with hexagonal end facets and were highly oriented towards the c-axis direction. Photoluminescence (PL) spectra of the hydrothermal layers were composed of the ultraviolet (UV) emission (370 to 380 nm) and the visible emission (481 to 491 nm), and the intensity ratio of the former emission (I UV ) to the latter emission (I VIS ) changed, depending on both the molarity of the solution and temperature. It is surprising that all the Hall mobilities for the hydrothermal ZnO layers were significantly larger than those for their corresponding CVD seed films. It was also found that, for the hydrothermal films grown at 70°C to 90°C, the molarity dependences of I UV /I VIS resembled those of mobilities, implying that the mobility in the film is affected by the structural defects. The highest mobility of 166 cm 2 /Vs was achieved on the hydrothermal film with the carrier concentration of 1.65 × 10 17 cm −3 grown from the aqueous solution of 40 mM at 70°C.

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“…3D ZnO micro/nanostructures have shown its potential applications in photocatalytic, gas sensors, nanogenerators, and solar cells [6][7][8]. Up to now, several methods including chemical bath deposition (CBD), hydrothermal route, electrodeposition, precursor calcinations, and so on [9][10][11][12][13][14][15][16], have been employed to prepare 3D ZnO hierarchical microstructures. Typically, flower-like ZnO nanostructures consisting of sword-like nanorods with 60-200 nm in width and several micrometers in length were obtained by a hydrothermal method at 200 and 160°C [14].…”

Section: Introductionmentioning

confidence: 99%

“…Typically, flower-like ZnO nanostructures consisting of sword-like nanorods with 60-200 nm in width and several micrometers in length were obtained by a hydrothermal method at 200 and 160°C [14]. A high density of a mixture of vertically aligned/non-aligned ZnO rods and flower-shaped structures on multilayer (ML) graphene could be obtained by electrochemical deposition without any pre-deposited ZnO seed layer or metal catalyst [15]. Xu et al reported that brush-like hierarchical ZnO nanostructures were synthesized via a nucleation and growth strategy [16].…”

Section: Introductionmentioning

confidence: 99%