Metal Oxide Nano-Honeycombs Prepared by Solution-Based Nanosphere Lithography and the Field Emission Properties

Kei, Chi-Chung; Kuo, Kun-Hua; Su, Cheng‐Kuan; Lee, Chao-Te; Hsiao, Chien-Nan; Perng, Tsong‐Pyng

doi:10.1021/cm061055o

Cited by 20 publications

(23 citation statements)

References 24 publications

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“…In general, in nanosphere lithography, a suspension of polystyrene nanospheres is cast onto a substrate, and as the solvent evaporates, surface tension effects induce the self‐assembly of the nanospheres into close‐packed hexagonal arrays with domain sizes of >0.01 mm 2 , where monolayer to bilayer thicknesses can be controllably achieved 10, 11. After the deposition of the nanospheres, the pattern of the resulting colloidal template can be transferred directly to the underlying substrate,10 converted to a directional through‐pore pattern,11 or inverted into a honeycomb pattern 12, 13. We focus on the latter, here.…”

Section: Resultsmentioning

confidence: 99%

“…Here, we demonstrate the fabrication of nanoperforated graphene with tunable superlattice parameters using self‐assembling nanosphere lithographic templates10–13 as selective etch masks. We show that the nanopatterning of the graphene modulates its electronic structure, giving rise to semiconducting behavior with an effective bandgap that is inversely related to the size of the nanoconstrictions that exist between the etched holes.…”

Section: Introductionmentioning

confidence: 99%

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Semiconducting Two‐Dimensional Graphene Nanoconstriction Arrays

Safron

Brewer

Arnold

2010

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The fabrication and characterization of two-dimensional nanoconstriction arrays consisting of sub-20-nm graphene constrictions and interconnecting graphene islands are reported. The arrays are fabricated in a scalable top-down fashion using self-assembled close-packed polystyrene nanospheres as lithographic templates and characterized using electron microscopy, Raman spectroscopy, and charge transport measurements. At room temperature, the arrays behave as semiconductors with a field-effect conductance modulation of up to 450 and charge mobilities of ~1 cm(2) V(-1) s(-1) . The effective bandgap of the arrays scales inversely with the nanoconstriction width, indicating that its magnitude is determined by quantum confinement in the constrictions. At low temperatures, the arrays act as semiconductors, with increasing ON/OFF conductance modulation up to ∼1000, and simultaneously act as 2D arrays of coupled Coulomb islands affected by single-electron charging events. The high conductance modulation of these nanopatterned graphene materials, combined with the scalability of the patterning approach is expected to impact thin film, flexible, and transparent semiconductor electronics.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Semiconducting Two‐Dimensional Graphene Nanoconstriction Arrays

Safron

Brewer

Arnold

2010

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“…[235][236][237] Besides the three types of nanomaterials that are commonly used for nanotechnology, another new class of materials that have fascinating properties and not confined to the nanoscale in any dimension is three-dimensional (3-D) nanomaterials. [238][239][240][241] These materials, termed as polycrystals or bulk nanomaterials, cluster-assembled materials, foams and hierarchically organized structures (Fig. 1), contain three arbitrary dimensions (length, width and height) above 100 nm with multiple arrangements of nanosize crystals, whose entire volume is filled with those nano-grains.…”

Section: Reviewmentioning

confidence: 99%

Phase dependent thermal and spectroscopic responses of Al₂O₃nanostructures with different morphogenesis

et al. 2015

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In this review, we discuss new developments and recent trends in both amorphous and crystalline Al2O3 oxide nanofluids related to their phase dependent characteristics in detail. Nowadays, nanofluids have gained significant attention with the enhanced energy/heat efficiency, which is highly desirable to improve the performance of any energy based devices and technology. This review article systematically describes the various chemical synthesis routes followed by bottom-up approaches, surface morphologies, and detailed microstructure characteristics, and phase dependent thermal as well as optical properties for potential use of such materials in various applications.

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“…The self-assembly technique combined with the solution-dipping strategy is a cost-effective and simple way to create micrometer-scale pore array. , The combination of the self-assembled polystyrene sphere (PSs) template method and solution-dipping strategy was an efficient approach to create periodic nanostructures. In addition, structures, such as nanobowl, − nanorod, nanohoneycomb, and nanoring arrays, − as well as other nanostructures, − have been fabricated. After the self-assembly process, the PSs come into the monolayer template; then, PSs template is transferred to the precursor solution, and the template will float due to the surface tension of the solution.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Well-Ordered Three-Phase Boundary with Nanostructure Pore Array for Mixed Potential-Type Zirconia-Based NO₂ Sensor

Wang

Liu

Yang

et al. 2016

ACS Appl. Mater. Interfaces

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A well-ordered porous three-phase boundary (TPB) was prepared with a polystyrene sphere as template and examined to improve the sensitivity of yttria-stabilized zirconia (YSZ)-based mixed-potential-type NO2 sensor due to the increase of the electrochemical reaction active sites. The shape of pore array on the YSZ substrate surface can be controlled through changing the concentration of the precursor solution (Zr(4+)/Y(3+) = 23 mol/L/4 mol/L) and treatment conditions. An ordered hemispherical array was obtained when CZr(4+) = 0.2 mol/L. The processed YSZ substrates were used to fabricate the sensors, and different sensitivities caused by different morphologies were tested. The sensor with well-ordered porous TPB exhibited the highest sensitivity to NO2 with a response value of 105 mV to 100 ppm of NO2, which is approximately twice as much as the smooth one. In addition, the sensor also showed good stability and speedy response kinetics. All these enhanced sensing properties might be due to the structure and morphology of the enlarged TPB.

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Metal Oxide Nano-Honeycombs Prepared by Solution-Based Nanosphere Lithography and the Field Emission Properties

Cited by 20 publications

References 24 publications

Semiconducting Two‐Dimensional Graphene Nanoconstriction Arrays

Semiconducting Two‐Dimensional Graphene Nanoconstriction Arrays

Phase dependent thermal and spectroscopic responses of Al₂O₃nanostructures with different morphogenesis

Fabrication of Well-Ordered Three-Phase Boundary with Nanostructure Pore Array for Mixed Potential-Type Zirconia-Based NO₂ Sensor

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Metal Oxide Nano-Honeycombs Prepared by Solution-Based Nanosphere Lithography and the Field Emission Properties

Cited by 20 publications

References 24 publications

Semiconducting Two‐Dimensional Graphene Nanoconstriction Arrays

Semiconducting Two‐Dimensional Graphene Nanoconstriction Arrays

Phase dependent thermal and spectroscopic responses of Al2O3nanostructures with different morphogenesis

Fabrication of Well-Ordered Three-Phase Boundary with Nanostructure Pore Array for Mixed Potential-Type Zirconia-Based NO2 Sensor

Contact Info

Product

Resources

About

Phase dependent thermal and spectroscopic responses of Al₂O₃nanostructures with different morphogenesis

Fabrication of Well-Ordered Three-Phase Boundary with Nanostructure Pore Array for Mixed Potential-Type Zirconia-Based NO₂ Sensor