A CuO nanowire infrared photodetector

Wang, S.B.; Hsiao, C. H.; Chang, Shoou‐Jinn; Lam, Kin-Tak; Wen, Kuo Hsun; Hung, Shang-Chao; Young, Sheng-Joue; Huang, Bohr–Ran

doi:10.1016/j.sna.2011.09.011

Cited by 180 publications

(80 citation statements)

References 23 publications

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“…8,9 Cupric Oxide (CuO) is a crystalline semiconducting oxide, which has attracted continued interest due to the wide range of nano-morphologies, [10][11][12] which can be formed using inexpensive and facile synthesis methods such as solution synthesis and thermal oxidation. CuO has an optical bandgap in the visible region 13 ($1.35 eV at 300 K) and reported device applications of nanostructured CuO include infra-red photodetectors, 14 gas sensors, 15 catalyst surfaces, 11 and field emission sources. 16 Many authors [17][18][19][20][21][22][23][24][25][26] have reported redshifts and broadening of the A g Raman peak obtained from various nanostructured CuO samples and have cited this as evidence of phonon confinement effects in their materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature and micro-morphology on the Ag Raman peak in nanocrystalline CuO thin films

Ravi

Kaiser

Bumby

2015

Journal of Applied Physics

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Raman spectra obtained from a nanocrystalline CuO thin film are observed to exhibit significant variation in the peak position and peak line-shape as a function of spatial position within the film. We attribute this effect to variation in the degree of local heating beneath the focused spot of the Raman probe laser. To understand this, we have undertaken a detailed study of the temperaturedependence of the CuO A g Raman peak. We observe a linear relationship between line-width and peak position, which persists over a wide temperature range, and is characteristic of a Raman process in which the temperature-dependence is dominated by anharmonic 3-phonon decay. We provide an analytical description of the Raman line-shape as a function of temperature and use this model to interpret the degree of laser heating observed within our sample. Using this relationship, we identify that the local micro-morphology of the CuO sample under study can dramatically affect the temperature achieved due to laser heating. We find that spectra collected from the surface of "micro-bubbles" within the CuO film studied can reach temperatures of >1000 K beneath the focused spot of our low power (5 mW) probe laser.

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Section: Introductionmentioning

confidence: 99%

Effect of temperature and micro-morphology on the Ag Raman peak in nanocrystalline CuO thin films

Ravi

Kaiser

Bumby

2015

Journal of Applied Physics

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“…1 Cupric oxide (CuO) nanowires, most commonly showing p-type conductivity and a band gap around 1.4 eV, 2 have been used in applications such as field effect transistors, 3 optoelectronics, 4,5 and, in particular, gas sensing. [6][7][8] Low-frequency conductance fluctuations are commonly observed in metals and semiconductors and have been utilized as indicator for material/technology quality and device reliability, 9 as well as for the characterization of generation-recombination centers.…”

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confidence: 99%

Low-frequency noise characterization of single CuO nanowire gas sensor devices

Steinhauer

Köck

Gspan

et al. 2015

Applied Physics Letters

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Low-frequency noise properties of single CuO nanowire devices were investigated under gas sensor operation conditions in dry and humid synthetic air at 350 °C. A 1/f noise spectrum was found with the normalized power spectral density of current fluctuations typically a factor of 2 higher for humid compared to dry atmosphere. A core-shell nanowire model is proposed to treat the noise as parallel combination of gas-independent bulk and gas-dependent surface noise components. The observed increase in 1/f noise in the presence of water vapor is explained in terms of Hooge's mobility fluctuation model, where the increased surface noise component is attributed to carrier scattering at potential fluctuations due to hydroxyl groups at the nanowire surface.

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“…Copper oxide nanoparticles are the most studied materials between all the metal oxides because of interesting properties as a p-type semiconductor with the possibility of a large difference in energy band gap. Copper oxide are used in many different applications such as nanofluid [7], gas sensors [8], anodes in battery [9], magnetic storage media [10], photodetectors [11], energetic materials [12], photocatalysis [13], antibacterial materials [14] and many others. Through the past few years, several methods used to fabricate the copper oxide nanoparticles including sol gel [15], hydrothermal [16], sonochemical [17], microwave [18] and solvothermal [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Solvents on Size of Copper Oxide Nanoparticles Fabricated using Photolysis Method

Mahmoud¹,

Kareem²,

Kareem³

2017

Asian J. Chem.

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INTRODUCTIONInorganic nanostructures materials with fully-determined morphologies having excellent properties and probable applications have received major attention in recent years. The nanoparticles of metal oxide are prominent in inorganic material research for developing different practical applications and these nanoparticles have individual chemical properties [1][2][3] depends on their structure, composition, shape and size [4][5][6]. Copper oxide nanoparticles are the most studied materials between all the metal oxides because of interesting properties as a p-type semiconductor with the possibility of a large difference in energy band gap. Copper oxide are used in many different applications such as nanofluid [7] [19]. Of all the above synthesis procedure, it appears to be very difficult to get a pure crystal of copper oxide material without adding many stabilizing agents. Actually, as it was adduced [20], the elaboration of copper oxide nanoparticles is usually accompanied by the presence of side product such Cu2O or Cu(OH)2. For this, the defy taken up in this paper is to fabricate pure copper oxide nanoparticles, in the nano range, using novel and the low-cost photolysis method without adding any stabilizing agent. This Copper oxide nanoparticles with different size were successfully fabricated by the photolysis method through the irradiation of copper oxalate complex with different solvents. The effect of the type of solvent on the size of nanoparticles was investigated. The structure and size of nanoparticles were determined using XRD and TEM, while the spectral properties of copper oxide nanoparticles investigated using FTIR and UV-visible. XRD diffraction studies obtained pure monoclinic structure of copper oxide without secondary phase and the size of particles (8.4 to 11.4 nm) depends strongly on the dielectric constant of solvents and the smallest particles of copper oxide were showed when using the ethanol as solvent. A blue shift in the essential gap energy (from 4.21 to 4.58 eV) due to the quantum confinement effect, is obtained in the spectra analysis when the particles size decreases. Effect of Solvents on Size of Copper Oxide Nanoparticles Fabricated using Photolysis Method Keywords: Copper oxide nanoparticles, Photolysis, Irradiation, Quantum confinement.process contained irradiation the complex or salt of copper to transform it from the oxidation state (+2) to oxidation state (+1) using an ice bath to avoid the high temperature then, the product burned at 300 °C. Furthermore, as it can be abstracted from this work when the fabricate parameters are well optimized, the photolysis method can produce a pure product. In this framework, the paper aim to study the effect of the solvent nature on the size of particles of the as-prepared copper oxide nanoparticles. EXPERIMENTALCopper oxide nanoparticles were prepared using potassium oxalate and copper sulphate (Sigma Aldrich, 99 %) as precursors.Preparation of complex and copper oxide nanoparticles: In two separate beakers, 3.1 g of potassium ox...

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A CuO nanowire infrared photodetector

Cited by 180 publications

References 23 publications

Effect of temperature and micro-morphology on the Ag Raman peak in nanocrystalline CuO thin films

Effect of temperature and micro-morphology on the Ag Raman peak in nanocrystalline CuO thin films

Low-frequency noise characterization of single CuO nanowire gas sensor devices

Effect of Solvents on Size of Copper Oxide Nanoparticles Fabricated using Photolysis Method

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