Gate-refreshable nanowire chemical sensors

Fan, Zhiyong; Lu, Jia Grace

doi:10.1063/1.1883715

Cited by 433 publications

(253 citation statements)

References 17 publications

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“…Semiconductor Nanowires (NW) with novel functionalities have attracted great interest for electronic applications such as piezoelectronics energy conversion devices, 1-4 as well as sensors, [5][6][7][8][9] memory 10 and optical devices. [11][12][13][14][15][16] Among such systems, ZnO has always stood out due to its attractive wide band gap (3.37 eV at room temperature) with a high exciton binding energy (60 meV), which makes it appropriate for short wavelength optoelectronic applications, such as ultra-violet (UV) detectors, and UV and blue light emitting devices.…”

Section: Introductionmentioning

confidence: 99%

ZnO UV photodetector with controllable quality factor and photosensitivity

et al. 2013

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ZnO nanowires have an enormous potential for applications as ultra-violet (UV) photodetectors. Their mechanism of photocurrent generation is intimately related with the presence of surface states where considerable efforts, such as surface chemical modifications, have been pursued to improve their photodetection capabilities. In this work, we report a step further in this direction demonstrating that the relative photosensitivity and quality factor (Q factor) of the photodetector are entirely tunable by an applied gate voltage. This mechanism enables UV photodetection selectivity ranging from wavelengths from tens of nanometers (full width at half maximum - FWHM) down to a narrow detection of 3 nm. Such control paves the way for novel applications, especially related to the detection of elements that have very sharp luminescence

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Section: Introductionmentioning

confidence: 99%

ZnO UV photodetector with controllable quality factor and photosensitivity

et al. 2013

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“…More interest in nanotechnology is growing due to the novel properties of nanomaterials and their potentials for applications in many fields. For example, nanowires can be potentially used in nanophotonics, lasers (Zimmler et al, 2008), nanoelectronics (Javey et al, 2007), solar cells (Tsakalakos et al, 2007), resonators (Tanner et al, 2007) and sensors (Fan et al, 2005). They could also be used as catalysts (Haruta et al, 1993), functional coatings, in nanoelectronics (Garnett et al, 2007) and energy storage .…”

Section: Introductionmentioning

confidence: 99%

Interaction of Nanoparticles in Biological Systems and their Role in Therapeutical Treatment of Tuberculosis and Cancer

Meena¹,

Singh²,

Sahare³

et al. 2014

JLA

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The kind of interactions which nanoparticles show in the biological systems is very interesting. Nanoparticles (NPs) on entering the living system immediately come in contact with proteins which serve many applications of nanoparticles including bio-signalling, therapeutics and drug delivery systems. Moreover, many inorganic oxide nanoparticles can also serve the purpose of antibacterial/antiviral by assisting in the production of reactive oxygen species (ROS). The role of nanoparticles in therapeutics is very significant and increasing day-by-day as it assures better treatment to the patient by enhancing activity of drug, improving bioavailability, flexibility in deciding route of administration and long term stability of drug resulting in better treatments of diseases. NPs such as solid lipid NPs, polymeric NPs, porous NPs, liposomes are being used for treatment of various types of diseases. Numerous carriers based drug delivery systems incorporating anti-TB drugs have been developed for target site actions. NPs encapsulating anti-cancer drugs such as doxorubicin, paclitaxel have also been developed for treatment of different types of cancers. Results of these studies give hopes to the researchers for the use of nanoparticles in the field of therapeutics. The NPs can be toxic as well as nontoxic to the biological system. Therefore, some adverse effects, such as, cytotoxicity on inhaling some kinds of nanoparticles must be kept in mind for judicious use of such systems during synthesis or during handling. The paper describes recent developments in the field by reviewing the available literature.

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“…ZnO has a wide direct band gap, which coupled with the large exciton binding energy (60 meV), makes it a candidate for a variety of optoelectronic device applications such as light emitting diodes, lasers and UV photo-detectors [1,2]. ZnO gas sensors have also been demonstrated, with sensitivity to a range of vapours including alcohols, water vapour, ammonia and hydrogen [3,4,5,6,7,8]. The sensing mechanism common to semiconducting metal oxides, such as ZnO which is typically n-type due to oxygen vacancies and/or interstitial Zinc, involves the formation of a charge depletion layer on the surface due to electron trapping at adsorbed oxygen species [9,6].…”

Section: Introductionmentioning

confidence: 99%

“…Macro scale components and conventional manufacturing techniques cannot provide sensors that deliver the detection levels and low temperature operation increasingly required for future applications. For example thin-film metal oxide based gas sensors typically require heating to 200-400 • C. Hence, the move toward sensors fabricated from nanomaterials [10], such as metal oxide nanorods [3,4,5,7,8,6] that offer lower temperature operation and high-sensitivities due, primarily, to their high surface area to volume ratios.…”

Section: Introductionmentioning

confidence: 99%

Laser-assisted hydrothermal growth of size-controlled ZnO nanorods for sensing applications

Henley¹,

Fryar²,

Jayawardena³

et al. 2010

Nanotechnology

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Abstract. Pulsed laser irradiation is used to seed the low-temperature hydrothermal growth of ZnO nanorods. UV laser irradiation produces ZnO nanoparticles in solution that act as nucleation seeds for the subsequent hydrothermal growth of the nanorods. By systematically varying the seed density and/or the concentration of the reactants, the diameter of the nanorods can be controlled over a wide range with a narrow size distribution. The nanorods are linked into multi-pod structures, due to nucleation at a central seed, but ultrasonic processing of the solutions is shown to yield isolated nanorods. Three dimensional networks of these multi-pod structures are fabricated by drop cating the solution onto interdigitated electrodes and gas sensors, operating at room temperature, for ethanol, and water vapour and UV photo-sensor devices are demonstrated.

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Gate-refreshable nanowire chemical sensors

Cited by 433 publications

References 17 publications

ZnO UV photodetector with controllable quality factor and photosensitivity

ZnO UV photodetector with controllable quality factor and photosensitivity

Interaction of Nanoparticles in Biological Systems and their Role in Therapeutical Treatment of Tuberculosis and Cancer

Laser-assisted hydrothermal growth of size-controlled ZnO nanorods for sensing applications

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