UV detector from ZnO nanorods with electrodes resembling a wheatstone bridge pattern

2011 ◽  
Author(s):  
Arun Vasudevan ◽  
Soyoun Jung ◽  
Taeksoo Ji
Keyword(s):  
Zno Nanorods ◽  
Wheatstone Bridge ◽  
Uv Detector ◽  
Bridge Pattern

scholarly journals Enhanced photoresponse of a high-performance self-powered UV photodetector based on ZnO nanorods and a novel electrolyte by the piezo-phototronic effect

RSC Advances ◽  
2018 ◽  
Vol 8 (58) ◽  
pp. 33174-33179 ◽  
Author(s):  
Xiaoli Peng ◽  
Weihao Wang ◽  
Yiyu Zeng ◽  
Xinhua Pan ◽  
Zhizhen Ye ◽  
...  
Keyword(s):  
High Performance ◽  
Tensile Strain ◽  
Compressive Strain ◽  
Zno Nanorods ◽  
Uv Detector ◽  
Uv Photodetector ◽  
Self Powered

A flexible UV detector exhibits high performance. The photoresponse of the device under different upward angles (tensile strain) and downward angles (compressive strain) were studied. A 163% change in responsivity was obtained when the downward angle reached 60°.

Fabrication and characterization of a single-bridge nanorod between microgap electrodes

2014 ◽  
Vol 31 (2) ◽  
pp. 104-107 ◽  
Author(s):  
Qazi Humayun ◽  
Muhammad Kashif ◽  
Uda Hashim
Keyword(s):  
Zinc Acetate Dihydrate ◽  
Zno Nanorods ◽  
Hydrothermal Process ◽  
Zinc Nitrate ◽  
Wet Etching ◽  
Nitrate Hexahydrate ◽  
Zno Nanorod ◽  
Uv Detector ◽  
Etching Technique ◽  
Content Type

Purpose – The purpose of this study was to investigate the performance of a single-bridge ZnO nanorod as a photodetector. Design/methodology/approach – The fabrication of the design sensor with ∼6-μm gap Schottky contacts and bridging of the ZnO nanorod were based on conventional photolithography and wet-etching technique. Prior to bridging, the ZnO nanorods were grown by the hydrothermal process. The 0.35 M seed solution was prepared by dissolving zinc acetate dihydrate in 2-methoxyethanol, and monoethanolamine, which acts as a stabilizer, was added drop-wise. Before starting the solution deposition, and oxide, titanium (Ti) and gold (Au) layer deposition, p-type (100) silicon substrate was cleaned with Radio Corporation of America (RCA1) and RCA2, followed by dipping in diluted hydrofluoric acid. The aged solution was dropped onto the surface of the Au microgap structure, using a spin coater at a spinning speed of 3,000 rpm for 45 seconds, and then dried at 300°C for 15 minutes, followed by annealing at 400°C for 1 hour. The hydrothermal growth was carried out in an aqueous solution of zinc nitrate hexahydrate (0.025 M) and hexamethyltetramine (0.025 M). Findings – In this study, ZnO nanorods were grown on a SiO2 substrate by the hydrothermal method. Microgap electrodes with ∼6-μm spacing were achieved by using the wet-etching process. After the growth process, an area-selective mask was utilized to reduce the number of rods between the nearby gap areas. The obtained single ZnO nanorod was tested for the UV-sensing application. The single ZnO nanorod photodetector exhibited a UV photoresponse, thereby indicating potential as a cost-effective UV detector. The response and recovery times of the fabricated device were 65 and 95 seconds, respectively. Structural analysis was captured using X-ray Diffraction (XRD), whereas surface morphology was determined using scanning electron microscopy. Originality/value – This paper demonstrates the effect of UV photon on a single-bridge ZnO nanorod between microgap electrodes.

Synthesis and fast-response of a photodetector of hydrothermally grown ZnO nanorods through the use of a graphene oxide/ZnO seed layer

RSC Advances ◽  
2015 ◽  
Vol 5 (114) ◽  
pp. 94222-94226 ◽  
Author(s):  
Giwoong Nam ◽  
Jae-Young Leem
Keyword(s):  
Graphene Oxide ◽  
Hydrothermal Method ◽  
Seed Layer ◽  
Zno Nanorods ◽  
Fast Response ◽  
Zno Nanorod ◽  
Uv Detector

We used a hydrothermal method combined with a graphene oxide (GO)/ZnO seed layer to fabricate a ZnO nanorod based fast-response UV detector.

scholarly journals Silicon Microcantilevers with ZnO Nanorods/Chitosan-SAMs Hybrids on Its Back Surface for Humidity Sensing

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 838 ◽  
Author(s):  
Jiushuai Xu ◽  
Maik Bertke ◽  
Xuejing Li ◽  
Andi Setiono ◽  
Michael Fahrbach ◽  
...  
Keyword(s):  
High Surface ◽  
Zno Nanorods ◽  
High Surface Area ◽  
Volume Ratio ◽  
High Sensitivity ◽  
Wheatstone Bridge ◽  
Back Surface ◽  
Direct Reading ◽  
Sensing Material ◽  
Assembled Monolayers

This paper reports a piezoresistive silicon microcantilever-based gravimetric humidity sensor, where a ZnO nanofilm (200 nm) and ZnO nanorods (NRs) with different lengths (1.5 µm and 6 µm) modified with chitosan self-assembled monolayers (SAMs) are coated on the microcantilevers’ back surface as the sensing material. Thanks to the new sensor design, the resonant frequency (RF) shifts induced by the mass adsorption on the high surface-area-to-volume ratio, hybrid-sensing nanostructure can be tracked directly by monitoring the output of the p-diffused full Wheatstone bridge. By depositing ZnO NRs and Chitosan SAMs, direct-reading microcantilevers with high repeatability, reliability and high sensitivity (15 Hz/%RH) can be achieved.

Fabrication of Branched Flower-Like ZnO/Si Hierarchical Heterostructure UV Detector by Aqueous Method

2020 ◽  
Vol 20 (10) ◽  
pp. 6385-6388 ◽  
Author(s):  
Sitong Liu ◽  
Naisen Yu ◽  
Yunfeng Wu
Keyword(s):  
Optical Properties ◽  
High Performance ◽  
Zno Nanorods ◽  
High Response ◽  
Si Nanowires ◽  
Uv Detector ◽  
Uv Photodetectors ◽  
Aqueous Method ◽  
Uv Response

High performance ZnO/Si hierarchical heterostructure UV detector was fabricated using an aqueous method. The structural, morphological and optical properties of the hierarchical heterostructure were characterized. The heterostructural UV detector was composed of ZnO nanorods grown on Si nanowires to form a flower-like structure. The device results demonstrated that the as-grown ZnO/Si hierarchical heterostructure showed high UV response. The method provides a simple way to fabricate high-response UV photodetectors based on ZnO/Si heterostructure.

Flexible UV detector based on carbon fibers, ZnO nanorods, and Ag nanowires

2017 ◽  
Vol 5 (18) ◽  
pp. 4537-4542 ◽  
Author(s):  
Geon Jang ◽  
Su Jeong Lee ◽  
Daewoo Lee ◽  
Dongwon Lee ◽  
Woong Lee ◽  
...  
Keyword(s):  
Carbon Fibers ◽  
Composite Structure ◽  
Uv Light ◽  
Zno Nanorods ◽  
Spray Coating ◽  
Optical Transmittance ◽  
Uv Detector ◽  
Ag Nanowires

In a CF/ZnO NR composite structure, Ag NWs were deposited via spray-coating as a top electrode, which has good mechanical flexibility and optical transmittance to UV light.

Development and Validation of A Reversed Phase-High Performance Liquid Chromatography Method for the Quantitative Estimation of Ramipril Drug Content from Formulated Dosage Form

2016 ◽  
Vol 6 (3) ◽  
Author(s):  
Raju Chandra ◽  
Manisha Pant ◽  
Harchan Singh ◽  
Deepak Kumar ◽  
Ashwani Sanghi
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Active Ingredient ◽  
High Performance ◽  
Limit Of Detection ◽  
Quantitative Estimation ◽  
Reversed Phase ◽  
Uv Detector ◽  
Chromatography Method ◽  
Drug Content

A reliable and reproducible reversed-phase high performance liquid chromatography (RP-HPLC) was developed for the quantitative determination of Remipril drug content from marketed bulk tablets. The active ingredient of Remipril separation achieved with C18 column using the methanol water mobile phase in the ratio of 40:60 (v/v). The active ingredient of the drug content quantify with UV detector at 215 nm. The retention time of Remipril is 5.63 min. A good linearity relation (R2=0.999) was obtained between drug concentration and average peak areas. The limit of detection and limit of quantification of the instrument were calculated 0.03 and 0.09 µg/mL, respectively. The accuracy of the method validation was determined 102.72% by recoveries method.

Validation of Simvastatin Analysis Methods in Human Blood Plasma (In Vitro) Using HPLC-UV Detector

2018 ◽  
Vol 8 (2) ◽  
Author(s):  
Iyan Sopyan ◽  
Cynthia Jaya ◽  
Driyanti Rahayu
Keyword(s):  
Blood Plasma ◽  
Human Plasma ◽  
Disease Risk ◽  
Protein Precipitation ◽  
Precipitation Method ◽  
Human Blood Plasma ◽  
Analysis Method ◽  
Uv Detector ◽  
Number Of Patients ◽  
System Suitability

The use of simvastatin (SV) increases along with the increasing number of patients with hyperlipidemia and cardiovascular disease risk factors. Consequently, this condition leads to the increasing need of analytical determination of SV in blood plasma. Analysis of SV in human plasma using protein precipitation method and HPLC with UV detector has not been reported. This research was purpose to find out the rapid, accurate, and valid of SV analysis method in human plasma. In this research plasma samples were treated with protein precipitation method. The analyte was then analyzed using HPLC with C18 column 250x4 mm and 5 µm of particle size, the mobile phase contained of phosphate buffer 0.01 M (pH 4.0) and acetonitrile 30:70 v/v with flow rate 1 mL/minute, and detected at 239 nm. The analysis method was validated based on some parameters, such as selectivity, accuracy, precision, repeatability, linearity, LOD, LOQ, and system suitability. The result showed selectivity represented by Rs was 2.870, repeatability by its CV less than 2%, and linearity by its coefficient correlation (r) 0.9992 for concentration range 0.08-0.32 ppm. Based on chromatogram peak area, LOD and LOQ were 0.0132 and 0.0440 ppm respectively, accuracy and precision were 86.25-89.36% and 0.66-1.81% were obtained. The result of system suitability test from retention time and chromatogram peak area showed by its CV less than 2%. The analysis method was proved to be valid for SV analysis in human plasma

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