ZnO nanoparticle surface acoustic wave UV sensor

Chivukula, Venkata; Čiplys, D.; Shur, M. S.; Dutta, P.S.

doi:10.1063/1.3447932

Cited by 78 publications

(57 citation statements)

References 18 publications

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“…Simple SAW can be used to transport charge carriers in semiconductor quantum well structures fabricated in thin-film GaAs=InGaAs atop LN (Rotter et al, 1999) to even form moving quantum dots as reported by Fletcher et al (2003), naturally leading to the use of such quantum dots in quantum computing by Furuta et al (2004) and even SAW-induced luminescence (Gell et al, 2006) in the quest to obtain a single-photon source. Aside from quantum applications, the ability to transport charge within semiconductors offers interesting applications in UV detectors using epitaxial ZnO thin films (Emanetoglu et al, 2004) and ZnO nanoparticles (Chivukula et al, 2010), and even solar cells (Yakovenko et al, 2009). …”

Section: A Improvement Of Analysis Techniquesmentioning

confidence: 99%

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

2011

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This article reviews acoustic microfluidics: the use of acoustic fields, principally ultrasonics, for application in microfluidics. Although acoustics is a classical field, its promising, and indeed perplexing, capabilities in powerfully manipulating both fluids and particles within those fluids on the microscale to nanoscale has revived interest in it. The bewildering state of the literature and ample jargon from decades of research is reorganized and presented in the context of models derived from first principles. This hopefully will make the area accessible for researchers with experience in materials science, fluid mechanics, or dynamics. The abundance of interesting phenomena arising from nonlinear interactions in ultrasound that easily appear at these small scales is considered, especially in surface acoustic wave devices that are simple to fabricate with planar lithography techniques common in microfluidics, along with the many applications in microfluidics and nanofluidics that appear through the literature.

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Section: A Improvement Of Analysis Techniquesmentioning

confidence: 99%

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

2011

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“…ZnO is the only semiconductor material extensively investigated after Si/Ge. Robust ZnO has important applications in the field of biosensors, solar cell window, surface acoustic devices, gas sensor, and piezo actuator devices [2,3]. Recently, semiconductor nanoparticles have attracted much attention due to their excellent properties like optical, structural, and magnetic.…”

Section: Introductionmentioning

confidence: 99%

Development and study of the structural and optical properties of hexagonal ZnO nanocrystals

2012

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ZnO is a promising member of the semiconducting materials of II-VI group. ZnO nanocrystals have shown potential applications in various novel technologies. In the present investigation of ZnO nanocrystals, a novel chemical route using Zinc acetate as organic precursor is being reported. ZnO nanocrystals were characterized using X-ray diffraction, scanning electron microscopy UV-visible (UV-vis) spectroscopy, and photoluminescence measurements. The X-ray diffraction studies reveal the typical hexagonal structure of ZnO nanocrystals along the preferred orientation of (101) and (100) planes. The optical bandgap of ZnO nanocrystals was found to be 3.50 eV from the absorbance spectrum, which is higher than that of the bulk ZnO material. A blueshift of 21 nm is observed in the excitonic transitions, which clearly indicates the formation of ZnO nanocrystals. Photoluminescence spectroscopy of the ZnO nanocrystals showed a strong emission peak at 365 nm near the band edge along with a weak green-yellow emission peak spanning the range of 450 to 600 nm. The blueshifting was also observed in the photoluminescence spectrum, in accordance with the UV-vis spectroscopy in contrast to the bulk ZnO material.

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“…Fro m Fig.2, it is obviously that the SAW velocity decreases monotonously with the sheet conductivity of sensing layer increasing and this analytic solution can be used to explain the reported experimental results [10][11][12] appro ximately. In fact, the response of detector is affected by many co mp lex factors, so an accurate simulat ion for the optimization design and the characteristics analysis of detector is very necessary.…”

Section: A the Conductivity Sensitive Theorymentioning

confidence: 73%

“…It is also found that the absorption of the detected material can change not only the mass of the sensing layer but also the sensing layer conductivity. And because of this, a lot of SAW sensors based on the sensing layer conductivity have been reported [8][9][10][11][12]. Therefore, in addition to the added mass, the variation of the sensing layer conductivity must be taken into consideration in the SAW sensor.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity simulation of surface acoustic wave ultraviolet detector by multi-physics method

Peng

2012

2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT)

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S urface acoustic wave (S AW) ultraviolet (UV) detector uses a thin Zinc Oxide (ZnO) nanowire sensing layer to detect the UV light. Since the sensing layer is a photo-conducting film, the sharp change of conductivity of it under UV light illumination becomes the most important factor affecting the propagation velocity of S AW due to the electric-acoustic interaction. The dependence of the S AW propagation velocity on the photo-conductivity of the sensing layer is simulated by multiphysics method and the results are presented and discussed. It is found that the propagation velocity of S AW decreases with increasing the conductivity of the thin ZnO nanowire sensing layer and vice versa. Thus, the sensitivity of the S AW UV detector, which is defined as the decrease of the central frequency under UV light illumination, is investigated using the suggested simulation model. It is found that the UV sensitivity is proportional to the designed frequency of S AW device as well as the thickness of sensing layer to some degree. However, an abnormal phenomenon that there is an UV sensitivity peak on the sensitivity-thickness curve with much larger range of sensing layer thickness will occur according to the simulation results. These simulation results can help optimizing and designing the S AW UV detector.

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ZnO nanoparticle surface acoustic wave UV sensor

Cited by 78 publications

References 18 publications

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

Development and study of the structural and optical properties of hexagonal ZnO nanocrystals

Sensitivity simulation of surface acoustic wave ultraviolet detector by multi-physics method

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