ZnO Nanostructures for Sensor Applications

2012 ◽  
Vol 185 ◽  
pp. 1-4 ◽  
Author(s):  
Tseung Yuen Tseng
Keyword(s):  
Gas Sensor ◽  
Vapor Phase ◽  
Gas Sensors ◽  
High Potential ◽  
Solution Growth ◽  
Zno Nanostructures ◽  
Phase Growth ◽  
Sensor Applications ◽  
Recent Developments ◽  
Wide Gap

The wide-gap semiconductor ZnO with nanostructures such as nanoparticles, nanorods, nanowires has high potential for a variety of sensor applications. This paper reviews the recent developments of ZnO one dimentional nanostructures for future gas sensor applications. Presented first is the factors contributing to the high performances of gas sensors using such nanostructures. Then various fabrication methods of the ZnO nanostructures including vapor phase growth, solution growth, and template-assisted growth are introduced. The characterization and properties of the ZnO nanostructures-based gas sensors are described. The basic mechanisms for explaining the behaviors of the gas sensors are also discussed.

scholarly journals SPM—SEM Investigations of Semiconductor Nanowires for Integrated Metal Oxide Gas Sensors

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 701 ◽  
Author(s):  
Verena Leitgeb ◽  
Katrin Fladischer ◽  
Frank Hitzel ◽  
Florentyna Sosada-Ludwikowska ◽  
Johanna Krainer ◽  
...  
Keyword(s):  
Electron Beam ◽  
Metal Oxide ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Semiconductor Nanowires ◽  
Kelvin Probe ◽  
Sensor Applications ◽  
Sensitivity And Selectivity ◽  
Stable Performance ◽  
Metal Oxide Gas Sensors

Integration of metal oxide nanowires in metal oxide gas sensors enables a new generation of gas sensor devices, with increased sensitivity and selectivity. For reproducible and stable performance of next generation sensors, the electric properties of integrated nanowires have to be well understood, since the detection principle of metal oxide gas sensors is based on the change in electrical conductivity during gas exposure. We study two different types of nanowires that show promising properties for gas sensor applications with a Scanning Probe Microscope—Scanning Electron Microscope combination. Electron Beam Induced Current and Kelvin Probe Force Microscopy measurements with a lateral resolution in the nanometer regime are performed. Our work offers new insights into the dependence of the nanowire work function on its composition and size, and into the local interaction between electron beam and semiconductor nanowires.

The Challenge for Large-scale Vapor-phase Growths of Not-catalyzed ZnO Nanostructures: Purity vs. Yield

2009 ◽  
Vol 1174 ◽  
Author(s):  
Davide Calestani ◽  
Ming Zheng Zha ◽  
Roberto Mosca ◽  
Laura Lazzarini ◽  
Giancarlo Salviati ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Vapor Phase ◽  
High Purity ◽  
Large Scale ◽  
Cost Effective ◽  
Zno Nanostructures ◽  
Phase Growth ◽  
Scale Growth ◽  
General Requirement ◽  
Vapor Phase Growth

AbstractLarge-scale growth capability is a general requirement for any reliable and cost-effective device application. Catalyst-free vapor-phase growth techniques generally let obtain high purity materials, but their application in large-scale growths of zinc oxide (ZnO) nanostructures is not trivial, because the lack of catalysts makes the control of these process rather difficult. Three different optimizations of the basic vapor phase growth have been studied and performed to obtain selected and reproducible growths of three different ZnO nanostructures with improved yield, i.e. nanotetrapods, nanowires and nanorods. No precursor or catalyst has been used in order to reduce contamination sources as more as possible.

scholarly journals Metal/Metal-Oxide Nanoclusters for Gas Sensor Applications

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Ahmad I. Ayesh
Keyword(s):  
Metal Oxide ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Recent Progress ◽  
Volume Ratio ◽  
Building Blocks ◽  
Special Focus ◽  
Gaseous Species ◽  
Sensor Applications ◽  
Metal Metal

The development of gas sensors that are based on metal/metal-oxide nanoclusters has attracted intensive research interest in the last years. Nanoclusters are suitable candidates for gas sensor applications because of their large surface-to-volume ratio that can be utilized for selective and rapid detection of various gaseous species with low-power consuming electronics. Herein, nanoclusters are used as building blocks for the construction of gas sensor where the electrical conductivity of the nanoclusters changes dramatically upon exposure to the target gas. In this review, recent progress in the fabrication of size-selected metallic nanoclusters and their utilization for gas sensor applications is presented. Special focus will be given to the enhancement of the sensing performance through the rational functionalization and utilization of different nanocluster materials.

Using of SILD technology for surface modification of SnO2 films for gas sensor applications

2002 ◽  
Vol 750 ◽  
Author(s):  
G. Korotcenkov ◽  
V. Macsanov ◽  
Y. Boris ◽  
V. Brinzari ◽  
V. Tolstoy ◽  
...  
Keyword(s):  
Surface Modification ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Sensor Applications ◽  
Layer Deposition ◽  
Ag Clusters ◽  
Ag Deposition ◽  
Gas Response ◽  
Ionic Layer ◽  
Deposition Technology

ABSTRACTThe possibilities of SILD (successive ionic layer deposition) technology for modification of surface properties of nano-scaled SnO2 films for gas sensor applications were studied and are discussed in this article. Samples of SnO2 with thickness ranging from 30–40 nm were deposited by spray pyrolysis from SnCl4-water solutions. Nano-clusters of Pd and Ag, deposited by the SILD method were applied for surface modification. PdCl2 and AgNO3 were used as precursors for Pd and Ag deposition on the SnO2 surface.It was found that the method of surface modification by SILD can be used for improving both the sensitivity and the rate of gas response of SnO2-based gas sensors to CO and H2. At the same time, the presence of Pd and Ag clusters on the surface of SnO2 depresses the gas response to ozone.

scholarly journals Development of Indium Titanium Zinc Oxide Thin Films Used as Sensing Layer in Gas Sensor Applications

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 807
Author(s):  
Sheng-Po Chang ◽  
Ren-Hao Yang ◽  
Chih-Hung Lin
Keyword(s):  
Thin Films ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Uv Light ◽  
Rf Sputtering ◽  
Metal Structure ◽  
Sensor Applications ◽  
Long Term Stability ◽  
Sensing Technology

InTiZnO gas sensors with different oxygen ratios were fabricated by RF sputtering at room temperature. The sensing responses for five different gases, including ethanol, isopropanol (IPA), acetone (ACE), CO, and SO2, were reported. The InTiZnO gas sensor with the MSM (metal–semiconductor–metal) structure generated a higher sensing response when the O2/Ar ratio was increased to 10%. It also revealed high selectivity among these gases and good repeatability. Moreover, the UV light-activated InTiZnO gas sensors were also studied, which could reduce the operating temperature from 300 °C to 150 °C and did not seem to damage the sensing film, demonstrating long-term stability. The high response and selectivity revealed that InTiZnO thin films possess high potential to be applied in gas sensing technology.

Electrical transduction in phthalocyanine-based gas sensors: from classical chemiresistors to new functional structures

2009 ◽  
Vol 13 (01) ◽  
pp. 84-91 ◽  
Author(s):  
Marcel Bouvet ◽  
Vicente Parra ◽  
Clémentine Locatelli ◽  
Hui Xiong
Keyword(s):  
Present Article ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Field Effect ◽  
Gas Sensing ◽  
Field Effect Transistors ◽  
Real Gas ◽  
Sensor Applications

Phthalocyanines are organic-based materials which have attracted a lot of research in recent times. In the field of sensors, they present interesting and valuable potentialities as sensing elements for real gas sensor applications. In the present article, and taking some of our experiments as representative examples, we review the different ways of transduction applied to such applications. Some of the new tendencies and transducers for gas sensing based on phthalocyanine derivatives are also reported. Among them, electrical transduction (resistors, field-effect transistors, diodes, etc.) has been, historically, the most commonly exploited way for the detection and/or quantification of gas pollutants, vapors and aromas, according to the conducting behavior of phthalocyanines. We will focus precisely on these systems.

scholarly journals Meso-/Nanoporous Semiconducting Metal Oxides for Gas Sensor Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Nguyen Duc Hoa ◽  
Nguyen Van Duy ◽  
Sherif A. El-Safty ◽  
Nguyen Van Hieu
Keyword(s):  
Metal Oxides ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Sensor Technology ◽  
Soft Template ◽  
Synthesis Methods ◽  
Sensor Applications ◽  
Advantages And Disadvantages ◽  
Nanoporous Metal ◽  
Semiconducting Metal Oxides

Development and/or design of new materials and/or structures for effective gas sensor applications with fast response and high sensitivity, selectivity, and stability are very important issues in the gas sensor technology. This critical review introduces our recent progress in the development of meso-/nanoporous semiconducting metal oxides and their applications to gas sensors. First, the basic concepts of resistive gas sensors and the recent synthesis of meso-/nanoporous metal oxides for gas sensor applications are introduced. The advantages of meso-/nanoporous metal oxides are also presented, taking into account the crystallinity and ordered/disordered porous structures. Second, the synthesis methods of meso-/nanoporous metal oxides including the soft-template, hard-template, and temple-free methods are introduced, in which the advantages and disadvantages of each synthetic method are figured out. Third, the applications of meso-/nanoporous metal oxides as gas sensors are presented. The gas nanosensors are designed based on meso-/nanoporous metal oxides for effective detection of toxic gases. The sensitivity, selectivity, and stability of the meso-/nanoporous gas nanosensors are also discussed. Finally, some conclusions and an outlook are presented.

scholarly journals Room-Temperature Gas Sensors Under Photoactivation: From Metal Oxides to 2D Materials

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Rahul Kumar ◽  
Xianghong Liu ◽  
Jun Zhang ◽  
Mahesh Kumar
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
Room Temperature ◽  
Gas Sensing ◽  
Sensor Technology ◽  
Light Illumination ◽  
Oxide Semiconductors ◽  
Sensor Applications ◽  
Two Dimensional Materials ◽  
Important Approach

AbstractRoom-temperature gas sensors have aroused great attention in current gas sensor technology because of deemed demand of cheap, low power consumption and portable sensors for rapidly growing Internet of things applications. As an important approach, light illumination has been exploited for room-temperature operation with improving gas sensor’s attributes including sensitivity, speed and selectivity. This review provides an overview of the utilization of photoactivated nanomaterials in gas sensing field. First, recent advances in gas sensing of some exciting different nanostructures and hybrids of metal oxide semiconductors under light illumination are highlighted. Later, excellent gas sensing performance of emerging two-dimensional materials-based sensors under light illumination is discussed in details with proposed gas sensing mechanism. Originated impressive features from the interaction of photons with sensing materials are elucidated in the context of modulating sensing characteristics. Finally, the review concludes with key and constructive insights into current and future perspectives in the light-activated nanomaterials for optoelectronic gas sensor applications.

Material and Structural Engineering of Metal Oxides Aimed for Gas Sensor Applications

2014 ◽  
Vol 974 ◽  
pp. 76-85 ◽  
Author(s):  
Ghenadii Korotcenkov ◽  
B.K. Cho
Keyword(s):  
Metal Oxides ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Noble Metals ◽  
Structural Engineering ◽  
Gas Sensing ◽  
Sensor Applications ◽  
Sensing Characteristics

In this review different aspects of material and structural engineering of metal oxides aimed for application in conductometric gas sensors (chemiresistors) were analyzed. Results, mainly obtained for SnO2and In2O3–based sensors during surface functionalizing by noble metals have been used for showing an opportunity of material and structural engineering of metal oxides to optimize gas sensing characteristics.

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