Conductimetric Detection of Protein and Cancer Cells with Oxide Nanosensors

2007 ◽  
Vol 1010 ◽  
Author(s):  
Janagama Goud ◽  
P. Markondeya Raj ◽  
Jin Liu ◽  
Mahadevan Iyer ◽  
Z. L. Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Cancer Cells ◽  
Gas Sensing ◽  
Low Cost ◽  
Electrochemical Techniques ◽  
Oxide Thin Film ◽  
Thin Film Sensors ◽  
Biochemical Sensing ◽  
Rabbit Igg ◽  
Thin Film Oxides

AbstractSemiconducting oxides are widely known and commercially applied for their gas sensing properties. However, biochemical sensing has mostly depended on optical and electrochemical techniques that are more cumbersome. This work investigates the biosensing characteristics of ZnO nanobelts and ZnO thin films. Zinc oxide thin film sensors showed changes in conductivity after protein functionalization with rabbit IgG and hybridization with anti-rabbit IgG. Conductivity changes were also measured after coating the oxides with MCF-7 cancer cells and its antibodies. In another set of experiments, ZnO nanobelts showed systematic conductivity changes with rabbit IgG protein hybridization. The experimental results in this paper indicate that the conductimetric properties of nano and thin film oxides can be sensitized to protein and cancer cell hybridization reactions. This technique can also be applied to certain other pathogen proteins or toxic proteins from the environment leading to low-cost miniaturized wireless biosensors.

Evaluation of depletion layer width and gas-sensing properties of antimony-doped tin oxide thin film sensors

2015 ◽  
Vol 220 ◽  
pp. 1354-1360 ◽  
Author(s):  
Jianqiao Liu ◽  
Xuesong Liu ◽  
Zhaoxia Zhai ◽  
Guohua Jin ◽  
Qiuxuan Jiang ◽  
...  
Keyword(s):  
Thin Film ◽  
Tin Oxide ◽  
Gas Sensing ◽  
Depletion Layer ◽  
Oxide Thin Film ◽  
Layer Width ◽  
Sensing Properties ◽  
Depletion Layer Width ◽  
Thin Film Sensors ◽  
Gas Sensing Properties

Zinc Oxide Thin Film Morphology as Function of Substrate Position During Sputtering Process

2021 ◽  
Vol 900 ◽  
pp. 103-111
Author(s):  
Christelle Habis ◽  
Jean Zaraket ◽  
Michel Aillerie
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Low Cost ◽  
Linear Increase ◽  
Oxide Thin Film ◽  
Central Position ◽  
Zinc Oxide Thin Film ◽  
Force Microscopy ◽  
Atomic Force ◽  
Great Transparency

Transparent conductive oxides are materials combining great transparency with high conductivity. In photovoltaic applications, they are developed under thin layer for the realization of upper electrodes of solar cells. Among transparent oxide materials, Zinc Oxide (ZnO) presents unique properties, starting with its first qualities to be abundant, low-cost and non-toxic oxide. Zinc Oxide thin film was deposited on rectangular glass substrate by magnetron sputtering. After an overview of the properties expected for good transparent conductive materials, the effect of distance from the center of the cell on the morphology of the film was investigated by Atomic Force Microscopy (AFM). The scanning was done on different area of the sample as function of the distance from the central position of the direct sputtering jet. As far as the distance increased, it has been noticed a quasi-linear increase in thickness of the ZnO deposited film and a change in the grain shape from spherical to pyramidal with an increase in the size of the particles. Controlling the sputtering distance allows the control of texture, thus of the Haze factor, the photo-generation of excitons, as well the optical transmission of the TCO layer and finally an improvement in the efficiency of the so-built photovoltaic cells.

scholarly journals Yttrium Doped TiO2 Thin Film for Gas Sensing Application Prepared by Spin Coating Method

2020 ◽  
Author(s):  
M Abdul Kaiyum ◽  
Naim Ahmed ◽  
Arif Alam ◽  
M Shamimur Rahman
Keyword(s):  
Thin Film ◽  
Photoelectron Spectroscopy ◽  
Gas Sensing ◽  
Low Cost ◽  
Pure Titanium ◽  
X Ray ◽  
Sensing Applications ◽  
Coating Method ◽  
Set Up ◽  
Spin Coater

Abstract Yttrium (Y) doped and pure Titanium Di-oxide (TiO2) thin films were prepared by using spin coater. The coater was set up in laboratory with low cost investment. The films were calcined at 450 °C for 1 hour. For characterization, Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Analysis (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Atomic Force Microscopy (AFM) were carried out. LCR Bridge - GW Instek LCR-821 was used for gas sensing applications. XPS showed that the change of electronic structure due to Y doping. SEM and AFM analysis were carried out to determine the surface morphology of the films. Yttrium (Y) decreased the crystallite size of the films and increased the surface roughness and porosity value, which was very good for many sensing applications. Gas sensing property of the deposited films were improved by the incorporation of yttrium impurities and the sensing property improved almost two times than pure TiO2 thin film. Different researches have been done their research related to this topic but no one researchers provide a precise explanation of their results, authors of this research have tried to do that. Moreover the films were prepared by a simple spin coater to reduce the production cost also.

A Solution Processed ZnO Thin Film

2012 ◽  
Vol 239-240 ◽  
pp. 1585-1588 ◽  
Author(s):  
Yuh Chung Hu ◽  
David T.W. Lin ◽  
Hai Lin Lee ◽  
Pei Zen Chang
Keyword(s):  
Thin Film ◽  
Aqueous Solution ◽  
Zinc Oxide ◽  
Low Cost ◽  
Zinc Acetate Dihydrate ◽  
Oxide Thin Film ◽  
Zno Thin Film ◽  
Acetate Dihydrate ◽  
Zinc Oxide Thin Film ◽  
Environmentally Friendly Process

The effect of Zinc-Oxide (ZnO) thin film annealed in different ambiences is presented. To achieve low cost and environmentally friendly process, ZnO aqueous solution is synthesized by dissolving zinc acetate dihydrate in deionized water directly. Zinc oxide aqueous solution of high solubility and stability is presented. High quality and dense Zinc oxide thin film is formed by spin coating. Annealing temperatures are in the range of 300 °C~500 °C, and annealing ambiences of both air and N2 are discussed.

TEM Study of the Effect of the Sapphire Substrate Surface Orientation on the Microstructure of Tin Dioxide Films

2001 ◽  
Vol 7 (S2) ◽  
pp. 1220-1221
Author(s):  
J. E. Dominguez ◽  
L. Fu ◽  
X. Q. Pan
Keyword(s):  
Thin Film ◽  
Laser Ablation ◽  
High Performance ◽  
Tin Dioxide ◽  
Substrate Surface ◽  
Sensor Arrays ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Oxide Thin Film ◽  
Thin Film Sensors

Tin dioxide (SnO2) has been extensively studied and used as gas sensors to detect toxic gases such as CO, NOxand flammable gases like H2.[l] Recently, considerable researches have focused on thin film sensors due to their high performance as well as their integration compatibility with semiconductor technology for making microsensors and sensor arrays. [2] The performance of thin film sensors is remarkably influenced by the way they were fabricated.[3] Among various deposition techniques, pulsed laser deposition (PLD) has shown great prominence in the deposition of a wide variety of oxide thin film materials such as high Tc superconductors, semiconductors and dielectrics. in this work we present our experimental results on tin dioxide films deposited using pulsed laser ablation on sapphire (α -Al2O3) substrates with different surface orientations.Tin oxide films with a thickness of 100 nm were deposited on the (1012) and (0001) sapphire by pulsed laser ablation of ceramic SnO2 targets.

scholarly journals Rapid Assembly of Multifunctional Thin Film Sensors for Wind Turbine Blade Monitoring

2013 ◽  
Vol 569-570 ◽  
pp. 515-522 ◽  
Author(s):  
Lars P. Mortensen ◽  
Dong Hyeon Ryu ◽  
Ying Jun Zhao ◽  
Kenneth J. Loh
Keyword(s):  
Thin Film ◽  
Impact Damage ◽  
Low Cost ◽  
Uniaxial Tensile ◽  
Electromechanical Properties ◽  
Thin Film Sensors ◽  
Frp Composite ◽  
Reinforced Polymer ◽  
Cost Of Energy ◽  
Operations And Maintenance

Wind is a competitive, clean, and fast-growing renewable energy industry. However, in order for wind to compete with fossil fuel-based energies, it is necessary to achieve lower cost of energy. One way is to reduce operations and maintenance costs by integrating structural health monitoring (SHM) systems with wind turbines. It has been found that the fiber-reinforced polymer (FRP) composite-based wind blades are susceptible to damage (e.g., cracks, debonding, and impact). Damage is typically invisible to the naked eye and can propagate rapidly to cause sudden failure. This work presents a new SHM approach using embedded thin film sensors for detecting damage in FRP-based wind blades. While previous studies have shown that carbon nanotube-based thin films can be incorporated with FRPs for sensing, this study further investigates their electromechanical properties. First, a unique spray fabrication approach was employed so that films can be assembled on a low cost basis and can be deposited onto any substrate or structure. Second, the electrical properties of films subjected to post-fabrication thermal annealing were compared. Finally, freestanding films were prepared and subjected to uniaxial tensile cyclic loading while their resistivity was measured simultaneously. The results showed that these films were piezoresistive.

Fabrication and characterization of sol-gel-derived zinc oxide thin-film transistor

2010 ◽  
Vol 25 (4) ◽  
pp. 695-700 ◽  
Author(s):  
Young Hwan Hwang ◽  
Seok-Jun Seo ◽  
Byeong-Soo Bae
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Low Cost ◽  
Sol Gel ◽  
Solution Process ◽  
Precursor Solution ◽  
Solution Concentration ◽  
Oxide Thin Film ◽  
Zno Films ◽  
Electron Conduction

Thin-film transistors (TFTs) with zinc oxide channel layers were fabricated through a simple and low-cost solution process. Precursor solution concentration, annealing temperature, and the process were controlled for the purpose of improving the electrical properties of ZnO TFTs and analyzed in terms of microstructural scope. The fabricated ZnO films show preferential orientation of the (002) plane, which contributes to enhanced electron conduction and a dense surface. The results show that the TFT characteristics of the film are clearly affected by the microstructure. The optimized TFT operates in a depletion mode, shows n-type semiconductor behavior, and is highly transparent (>90%) within the visible light range. It exhibits a channel mobility of 9.4 cm2/V·s, a subthreshold slope of 3.3 V/decade, and an on-to-off current ratio greater than 105. In addition, the result of N2 annealing shows the possibility of improvement in electrical property of the ZnO TFTs.

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