scholarly journals ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5118 ◽  
Author(s):  
Izabela Constantinoiu ◽  
Cristian Viespe
Keyword(s):  
Acoustic Wave ◽  
Metal Oxide ◽  
Surface Acoustic Wave ◽  
Synthesis Method ◽  
Metal Oxide Semiconductors ◽  
Oxide Semiconductor ◽  
Free Electrons ◽  
Oxide Semiconductors ◽  
Sensitive Film ◽  
Wave Sensors

Surface acoustic wave (SAW) gas sensors are of continuous development interest to researchers due to their sensitivity, short detection time, and reliability. Among the most used materials to achieve the sensitive film of SAW sensors are metal oxide semiconductors, which are highlighted by thermal and chemical stability, by the presence on their surface of free electrons and also by the possibility of being used in different morphologies. For different types of gases, certain metal oxide semiconductors are used, and ZnO is an important representative for this category of materials in the field of sensors. Having a great potential for the development of SAW sensors, the discussion related to the development of the sensitivity of metal oxide semiconductors, especially ZnO, by the synthesis method or by obtaining new materials, is suitable and necessary to have an overview of the latest results in this domain.

Engineering metal oxide semiconductor nanostructures for enhanced charge transfer: fundamentals and emerging SERS applications

2022 ◽  
Author(s):  
Samriti ◽  
Vishal Rajput ◽  
Raju Kumar Gupta ◽  
Jai Prakash
Keyword(s):  
Charge Transfer ◽  
Metal Oxide ◽  
Semiconductor Nanostructures ◽  
Metal Oxide Semiconductor ◽  
Metal Oxide Semiconductors ◽  
Oxide Semiconductor ◽  
Oxide Semiconductors ◽  
Transfer Processes

Fundamentals of doping engineering strategies of metal oxide semiconductors and various charge transfer processes for emerging SERS applications are discussed.

Recent advances and perspectives on constructing metal oxide semiconductor gas sensing materials for efficient formaldehyde detection

2020 ◽  
Vol 8 (38) ◽  
pp. 13169-13188
Author(s):  
Zejun Han ◽  
Yuan Qi ◽  
Zhengyi Yang ◽  
Hecheng Han ◽  
Yanyan Jiang ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Gas Sensing ◽  
Metal Oxide Semiconductor ◽  
Detection Performance ◽  
Metal Oxide Semiconductors ◽  
Oxide Semiconductor ◽  
Oxide Semiconductors ◽  
Effective Strategies ◽  
Recent Advances

The sensing mechanisms and effective strategies for enhancing the formaldehyde detection performance of metal oxide semiconductors have been reviewed.

scholarly journals Calculation of the grain potential barrier in the poly− and nanocrystalline semiconductors

2019 ◽  
Vol 20 (2) ◽  
pp. 122-128
Author(s):  
A. S. Ilin ◽  
V. M. Gololobov ◽  
E. A. Forsh ◽  
P. A. Forsh ◽  
P. K. Kashkarov
Keyword(s):  
Metal Oxide ◽  
Surface Charge ◽  
Potential Barrier ◽  
Surface States ◽  
Metal Oxide Semiconductors ◽  
High Concentration ◽  
Free Electrons ◽  
Oxide Semiconductors ◽  
Fully Depleted ◽  
Potential Barriers

The distribution of potential and parameters of potential barrier in semiconductor crystallite was calculated numerically. The calculation was carried out in spherical crystallite with evenly distributed donors and surface states. The calculation assumed that the surface charge is screened by both ionized donors and free electrons, the contribution of which cannot be neglected in semiconductors with high concentration of free electrons. The height of potential barrier is shown to nonmonotonically depend on the concentration of donors. The dependence of height of potential barrier on the concentration of donors may be divided into two part. One part of dependence describes the fully depleted crystallite and the second part describes the party depleted crystallite. On the first part the height of potential barrier increases with the donor concentration but on the second part the height of potential barrier decreases. The height of the potential barrier increases with increasing of concentration of surface states. The possibility of existing of potential barriers is estimated in nano− and polycrystalline metal oxide semiconductors used as sensitive layers of gas sensors. It is concluded that if the radius of crystal grains in metal oxide semiconductors does not exceed 10 nm, the explanation of the sensitivity of the sensor to gas by using a commonly barrier model seems unlikely. It is demonstrated that shape of crystallite and the contribution of free electrons to screening of surface charge have to be taken into account to calculation of width of potential barrier.

Implementation of Surface Acoustic Wave Vapor Sensor Using Complementary Metal–Oxide–Semiconductor Amplifiers

2009 ◽  
Vol 48 (4) ◽  
pp. 04C182
Author(s):  
Chia-Sung Chiu ◽  
Ching-Chun Chang ◽  
Chia-Lin Ku ◽  
Kang-Ming Peng ◽  
Erik S. Jeng ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Metal Oxide ◽  
Surface Acoustic Wave ◽  
Complementary Metal Oxide Semiconductor ◽  
Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Vapor Sensor

Metal oxide based surface acoustic wave sensors for fruits maturity detection

2016 ◽  
Author(s):  
N. H. Hasanuddin ◽  
M. H. A. Wahid ◽  
M. M. Shahimin ◽  
N. A. M. Ahmad Hambali ◽  
N. R. Yusof ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Metal Oxide ◽  
Surface Acoustic Wave ◽  
Acoustic Wave Sensors ◽  
Wave Sensors

Aluminum Nitride Thin Film Based Surface Acoustic Wave Sensors

2008 ◽  
Author(s):  
A. Kabulski ◽  
V. R. Pagán ◽  
D. Cortes ◽  
R. Burda ◽  
O. M. Mukdadi ◽  
...  
Keyword(s):  
Thin Film ◽  
Acoustic Wave ◽  
Aluminum Nitride ◽  
Surface Acoustic Wave ◽  
Acoustic Wave Sensors ◽  
Wave Sensors

scholarly journals Surface Acoustic Wave Biosensor with Laser-Deposited Gold Layer Having Controlled Porosity

Chemosensors ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 173
Author(s):  
Dana Miu ◽  
Izabela Constantinoiu ◽  
Valentina Dinca ◽  
Cristian Viespe
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Gold Film ◽  
Good Control ◽  
Gold Layer ◽  
Porous Gold ◽  
Deposition Parameters ◽  
Acoustic Wave Sensors ◽  
Controlled Porosity ◽  
Wave Sensors

Laser-deposited gold immobilization layers having different porosities were incorporated into love wave surface acoustic wave sensors (LW-SAWs). Variation of pulsed laser deposition parameters allows good control of the gold film morphology. Biosensors with various gold film porosities were tested using the biotin–avidin reaction. Control of the Au layer morphology is important since the biotin and avidin layer morphologies closely follow that of the gold. The response of the sensors to biotin/avidin, which is a good indicator of biosensor performance, is improved when the gold layer has increased porosity. Given the sizes of the proteins, the laser-deposited porous gold interfaces have optimal pore dimensions to ensure protein stability.

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