Gas Sensing With Mats of Gold-Nanoparticle Decorated GaN Nanowires

Berven, Christine; Dobrokhotov, Vladimir; McIlroy, David N.; Chava, Sirisha; Abdelrahaman, R.; Heieren, A.; Dick, Joseph; Barredo, W.

doi:10.1109/jsen.2008.923181

Cited by 21 publications

(13 citation statements)

References 14 publications

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“…In this report, we present a detailed structural study and elastic properties of a porphyrin based nanostructure with focus on the structure-property relationship of this system. Synthetic porphyrins are an important class of organic semiconductors that structurally and functionally resemble natural light harvesting chromophores and they are promising building blocks This journal is © The Royal Society of Chemistry 2014 Nanoscale PAPER for organic electronics, 15 photovoltaics, 16,17 sensors, 8,18,19 and catalysts. 20 Porphyrin nanostructures may be prepared by a variety of methods including ionic self-assembly, 21,22 phasetransfer ionic self-assembly, 23 surfactant-assisted selfassembly, 24 and vapour condensation recrystallization.…”

Section: Introductionmentioning

confidence: 99%

Correlating elastic properties and molecular organization of an ionic organic nanostructure

Eskelsen

Schneider-Pollack

et al. 2014

Nanoscale

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Mechanical and structural properties of ionically self-assembled nanostructures of meso-tetra(4-sulfonatophenyl)porphyrin (TSPP) and meso-tetra(4-pyridyl)porphyrin (TPyP) are presented. This is the first time that elastic modulus of an ionic porphyrin nanostructure has been reported. X-ray photoelectron spectroscopy (XPS), UV-visible spectra, and elemental analysis all support a stoichiometric 1 : 1 TSPP to TPyP composition. Atomic force microscopy (AFM) revealed that the porphyrin nanostructure is composed of stacked ribbons about 20 nm tall, 70 nm wide, and several microns in length. High resolution transmission electron microscopy (HRTEM) images showed clear lattice fringes 1.5 ± 0.2 nm in width aligned along the length of the nanorod. Selected area electron diffraction (SAED) and powder X-ray diffraction patterns of TSPP:TPyP are consistent with an orthorhombic system and space group Imm2 with lattice parameters a = 26.71 Å, b = 20.16 Å, and c = 8.61 Å. Crystallographic data is consistent with an arrangement of alternating face-to-face TSPP and TPyP molecules forming ordered columns along the length of the nanorods. The structural integrity of the solid is attributed to combined noncovalent interactions that include ionic, hydrogen bonding, and π-π interactions. The values of Young's modulus obtained for the crystalline TSPP:TPyP nanorods averaged 6.5 ± 1.3 GPa. This modulus is comparable to those reported for covalently bonded flexible polymeric systems. The robust bonding character of the TSPP:TPyP nanostructures combined with their mechanical properties makes them excellent candidates for flexible optoelectronic devices.

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Section: Introductionmentioning

confidence: 99%

Correlating elastic properties and molecular organization of an ionic organic nanostructure

Eskelsen

Schneider-Pollack

et al. 2014

Nanoscale

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“…Some are easier to contact than others. For example, measurements on a mat of nanowires are easier because they are well connected to each other because of their one-dimensional structure [6]. Making electrical contact to nanoparticles, unless in the form of a uniform thin film, is difficult and device reproducibility can also be difficult to achieve [7].…”

Section: Methodsmentioning

confidence: 99%

Robust conductivity changes in ZnO and MgZnO nanoparticle films from annealing in hydrogen ambient

Chava

Young

Sanchez

et al. 2011

2011 11th IEEE International Conference on Nanotechnology

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We report changes observed in the I-V characteristics of ZnO and MgZnO nanoparticle thin films after annealing in H 2 at sufficiently high temperatures. The nanoparticles were grown on insulating silicon substrates and had an average diameter of 30 nm. The devices were of a two terminal design, where the terminals consisted of two 25 μm diameter gold wires laid parallel to each other on the nanoparticle film to measure the current passing through the film. When exposed to H 2 gas at room temperature, no significant changes in the current-voltage behavior of the nanoparticles were observed relative to measurements done in vacuum. Annealing in H 2 below 100 ˚C also resulted in no significant change in the current. When annealed above 100 ˚C, we observed an increase of about a factor of twenty that was semi-permanent. The origin of the change in I-V characteristics of ZnO and MgZnO nanoparticles when annealed in H 2 will be discussed.Index Terms -ZnO and MgZnO nanoparticles, hydrogen ambient, nanoparticle conductivity.

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“…Previous investigations related to H 2 sensing, proposed that GaN nanostructures are potential and very promising candidates [8,[51][52]. However, the sensing performance was found to be restricted by several drawbacks, such as low sensitivity, high working temperature (which may result from the low surface area and poor surface microstructure), complicated manufacturing process, etc.…”

Section: Introductionmentioning

confidence: 99%

Pt-decorated GaN nanowires with significant improvement in H 2 gas-sensing performance at room temperature

Abdullah

Yam

Hassan

et al. 2015

Journal of Colloid and Interface Science

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Gas Sensing With Mats of Gold-Nanoparticle Decorated GaN Nanowires

Cited by 21 publications

References 14 publications

Correlating elastic properties and molecular organization of an ionic organic nanostructure

Correlating elastic properties and molecular organization of an ionic organic nanostructure

Robust conductivity changes in ZnO and MgZnO nanoparticle films from annealing in hydrogen ambient

Pt-decorated GaN nanowires with significant improvement in H 2 gas-sensing performance at room temperature

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