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This paper presents flexible ultraviolet (UV) photodetectors (PDs) based on zinc oxide (ZnO) nanowires (NWs) for wearable dosimetry. High-crystal quality ZnO NWs are synthesized by chemical vapour transport on sapphire substrates, and thereafter, they were transferred to flexible substrate and aligned using dielectrophoresis (DEP). The control over DEP parameters permits creating large-area arrays...
Recently a multilayered structure with a low-velocity layer sandwiched between two high-velocity materials, one of which also works as a supporting substrate and another one as a coat isolating the wave from the influence of undesired external factors, was suggested for application in packageless sensors [1,2]. The thickness of a middle piezoelectric layer must be sufficient to confine the wave within...
In this study, we present an integration routine for self-aligned ZnO nanoparticle-based thin-film transistors (TFTs) to be implemented on flexible electronics. As a proof of concept, first experiments were performed on a borosilicate glass, and subsequently the integration process was carried out on a polyethylene terephthalate (PET) substrate. The TFTs operate at low voltage (Von around 1 V) and...
This paper describes the potential of the AlN/ZnO/LiNbO3 structure for packageless surface acoustic wave sensors. This structure, based on the waveguiding acoustic wave principle, is studied numerically and experimentally.
In general surface acoustic wave (SAW) devices are made on piezoelectric substrates, hence difficult to integrate with circuits made on silicon. SAW devices can be realized on a silicon substrate using a film of piezoelectric material in conjunction with interdigital transducers (IDT) facilitating monolithic integration of SAW devices with circuits. Normally, SAW resonators consist of reflector gratings...
A compact SAW resonator on silicon substrate has been proposed based on complete reflection property of shear horizontal surface waves at free edges and the Love wave generation capability of ZnO film in conjunction with IDT, the proposed device was fabricated and characterized. Love waves are excited in the overlaid ZnO film on silicon substrate and vertical grooves are micromachined into silicon...
This work reports on the ability of ZnO nanostructures deposited using thermal chemical vapour deposition (TCVD) method as the sensing membrane for extendend-gate field effect transistor (EGFET) application. Four samples was prepared at different deposition time ranging from 500 to 650 °C in order to study the effect of deposition temperature on EGFET pH sensor performance. The surface morphology...
This paper reports on deposition process of Zinc Oxide (ZnO) using a simple electrochemical approach. The ZnO thin film was deposited on the Aluminium (Al) substrate in an aqueous solution of Zinc Chloride (ZnCl2) at room temperature using two terminals electrochemical cell that consisted of positive and negative electrodes. Two types of Al substrate were used, which are Al foil and Al plate. Al foil...
An analytical analysis of stress profile in cylindrical nanowires vertically grown on silicon (Si) substrate has been performed. Depending on the lattice-mismatch a tensile stress as high as 1GPa for TiO2 nanowires and a compressive stress of 900MPa for InP nanowires has been obtained. The angular component of stress remains small indicating the nanowires will not be twisted as a result of the substrate-induced...
The effect on the stress profile for more than one nanowire constituting a matrix has been analyzed. There from it has been made evident that substrate as well as process-induced stress, irrespective of its nature, within the basal plane of a single nanowire gets reduced in a cluster of closely packed nanowires.
ZnO nanowires have potential applications as large area field emitters for plat panel x-ray source and high emission current is needed for such application. In this study, patterned ZnO nanowires with different separations have been fabricated on ITO coated glass substrate by thermal oxidation technique. It is found that the separation of the patterns affects the growth of ZnO nanowires. The field...
This paper describes two unique device topologies: single ZnO nanowire and array ZnO nanowire-based devices. Two device topologies have been fabricated and compared for their sensing performance. The single nanowire device has been fabricated through focused ion beam and e-beam lithography techniques while the SEM and EDAX analysis have been used to characterize the device. The IV characteristics...
This work reports the synthesis and materials characterization of novel heterogeneous nanostructures consisting of zinc oxide (ZnO) nanowires and silicon (Si) nanocrystals. Hydrothermal and non-thermal plasma synthesis techniques were utilized to create ZnO nanowires and Si nanocrystals, respectively. The heterostructures of ZnO nanowires and Si nanocrystals were formed and characterized using scanning...
High-frequency thin film transistors (TFTs) enable many important thin film circuits used in flexible large-area systems such as large bandwidth instrumentation amplifiers (related to fT) and high-frequency oscillators (related to fmax) [1,2]. In [3] fmax=10GHz and fT=2.9GHz were reported but using Si substrates and pulsed laser deposition for ZnO growth, which are incompatible with low-cost large-area...
This work reports about the fabrication of piezoelectric energy harvesting with ZnO nanostructure grown on polymeric based electrode. The piezoelectric film exhibits nanobranched morphology, which provide favorable conditions for dipoles orientation and thus the device is characterized with relatively low dielectric losses in the range of 0.4–3.9×10−2 and piezoelectric voltage of 3.8V at 4.8 kg mechanical...
Piezoelectric Zinc oxide (ZnO) have received considerable attention as material for flexible nanogenerator (NG) design due to strong potential for harvesting electrical energy of random body movements at low frequencies (<10 Hz), sonic waves and mechanical vibrations in wide range of frequencies. The vertically integrated NG (VING) structures have been widely investigated as a ZnO-based NG device...
In this study, we investigated the effect of doping zinc oxide (ZnO) microrods on fluorine-doped tin oxide (FTO) conductive glass without seed layer and its characteristics at the photo electrode of dye-sensitized solar cell (DSSC). Octadecyltrimethoxysilane (ODS; CH3(CH2)17Si(OCH3)3) deposited on the substrate form a self-assembled monolayer by to enhance the following growth of ZnO microrods. 0...
In2S3 quantum dot coated ZnO nanorod arrays have been synthesized via two step method. ZnO nanorod arrays were prepared by a facile and low-cost hydrothermal process, and In2S3 were deposited on the nanorods by a successive ionic layer adsorption and reaction technique. The structure, morphology, and optical properties of the In2S3/ZnO nanorod arrays are investigated. The photoelectorchemical measurements...
This paper comes with Zinc Oxide (ZnO) thin film deposition over virtually grown p-Si substrate and fabricated using the E-beam evaporation PVD technique. The simulation analysis of ZnO TF/p-Si introduces photo-generation rate, spectral response that has been carried out using the Silvaco ATLAS software. The surface morphology and structural characterization has been done by Field Emission Scanning...
we report on ZnO nanorods based acoustic transducer for sound pressure level sensing applications. The sensing element is a circular diaphragm (diameter: 27 mm) of Stainless steel (SS-304L) substrate, which also acts as a bottom electrode for the developed transducer. Prior to synthesis of nanorods, ZnO seed layer (∼100 nm) film was deposited by DC magnetron sputtering technique. ZnO nanorods were...
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