Effect of mesopore-induced strain/stress on the thermoelectric properties of mesoporous ZnO thin films

2018 ◽  
Vol 446 ◽  
pp. 160-167 ◽  
Author(s):  
Min-Hee Hong ◽  
Dong Il Shim ◽  
Hyung Hee Cho ◽  
Hyung-Ho Park
Keyword(s):  
Thin Films ◽  
Thermoelectric Properties ◽  
Zno Thin Films ◽  
Strain Stress ◽  
Mesoporous Zno

scholarly journals Effect of Surfactant Concentration Variation on the Thermoelectric Properties of Mesoporous ZnO

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Min-Hee Hong ◽  
Chang-Sun Park ◽  
Sangwoo Shin ◽  
Hyung Hee Cho ◽  
Won-Seon Seo ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Seebeck Coefficient ◽  
Thermoelectric Properties ◽  
Surfactant Concentration ◽  
Zinc Acetate Dihydrate ◽  
Zno Thin Films ◽  
Molar Ratio ◽  
Zno Films ◽  
Mesoporous Zno

The electrical and thermal conductivities and the Seebeck coefficient of mesoporous ZnO thin films were investigated to determine the change of their thermoelectric properties by controlling surfactant concentration in the mesoporous ZnO films, because the thermoelectric properties of mesoporous ZnO films can be influenced by the porosity of the mesoporous structures, which is primarily determined by surfactant concentration in the films. Mesoporous ZnO thin films were successfully synthesized by using sol-gel and evaporation-induced self-assembly processes. Zinc acetate dihydrate and Brij-76 were used as the starting material and pore structure-forming template, respectively. The porosity of mesoporous ZnO thin films increased from 29% to 40% with increasing surfactant molar ratio. Porosity can be easily altered by controlling the molar ratio of surfactant/precursor. The electrical and thermal conductivity and Seebeck coefficients showed a close correlation with the porosity of the films, indicating that the thermoelectric properties of thin films can be changed by altering their porosity. Mesoporous ZnO thin films with the highest porosity had the best thermoelectric properties (the lowest thermal conductivity and the highest Seebeck coefficient) of the films examined.

Ultrafast Dynamics of the Indoline Dye D149 on Mesoporous ZnO and Al2O3 Thin Films

2015 ◽  
Vol 229 (10-12) ◽  
Author(s):  
Oliver Flender ◽  
Peter W. Lohse ◽  
Juan Du ◽  
Torsten Oekermann ◽  
Mirko Scholz ◽  
...  
Keyword(s):  
Thin Films ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Zno Thin Films ◽  
Ultrafast Dynamics ◽  
Eosin Y ◽  
Mesoporous Thin Films ◽  
Mesoporous Zno ◽  
Mesoporous Thin Film ◽  
20 Nm

AbstractUltrafast photoinduced electron injection and subsequent relaxation steps of the indoline dye D149 were investigated for mesoporous thin films using pump–supercontinuum probe (PSCP) transient absorption spectroscopy in the range 370–770 nm. Three types of mesoporous ZnO layers were compared: Electrodeposited ZnO thin films prepared by using the structure-directing agents (1) Eosin Y (EY) and (2) Coumarin 343 (C343), which are known to produce ZnO layers of different morphology; and (3) mesoporous ZnO thin films consisting of sintered nanoparticles with a diameter of 20 nm. As a reference system, we used a “non-injecting” mesoporous thin film with large band-gap, consisting of Al

scholarly journals Single-Crystal Mesoporous ZnO Thin Films Composed of Nanowalls

2009 ◽  
Vol 113 (5) ◽  
pp. 1791-1794 ◽  
Author(s):  
Xudong Wang ◽  
Yong Ding ◽  
Zhou Li ◽  
Jinhui Song ◽  
Zhong Lin Wang
Keyword(s):  
Thin Films ◽  
Single Crystal ◽  
Zno Thin Films ◽  
Mesoporous Zno

Synthesize of Mesoporous ZnO Thin Films and Gas Sensing Property

2014 ◽  
Vol 960-961 ◽  
pp. 157-160
Author(s):  
Min Hee Hong ◽  
Yong June Choi ◽  
Tae Won Lee ◽  
Hee Yoon Chung ◽  
Hyung Ho Park
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Condensation Reaction ◽  
Sol Gel ◽  
Zno Thin Films ◽  
Gas Sensitivity ◽  
Complex Agent ◽  
Sol Gel Process ◽  
Sensor Properties ◽  
Mesoporous Zno

In this work, ordered mesoporous ZnO thin films was synthesized and gas sensor properties were introduced. Mesoporous ZnO thin films were successfully formed by sol-gel process. In ZnO structure, complex agent (MEA) was used for the hydration and condensation reaction. According to the change of MEA concentration, porosity and pore arrangement, specific surface area could be changed. As complex agent concentration decreased, pore ordering was increased and gas sensitivity has the high value (8.01).

Thermoelectric properties of nanostructured Al-substituted ZnO thin films

2012 ◽  
Vol 520 (23) ◽  
pp. 6869-6875 ◽  
Author(s):  
Nina Vogel-Schäuble ◽  
Yaroslav E. Romanyuk ◽  
Songhak Yoon ◽  
Kachirayil J. Saji ◽  
Sascha Populoh ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermoelectric Properties ◽  
Zno Thin Films

Gas sensing properties of 3D mesoporous nanostructured ZnO thin films

2018 ◽  
Vol 42 (16) ◽  
pp. 13573-13580 ◽  
Author(s):  
V. L. Patil ◽  
S. S. Kumbhar ◽  
S. A. Vanalakar ◽  
N. L. Tarwal ◽  
S. S. Mali ◽  
...  
Keyword(s):  
Thin Films ◽  
Hydrothermal Method ◽  
Glass Substrate ◽  
Gas Sensing ◽  
Three Dimensional ◽  
Zno Thin Films ◽  
Zno Nanostructure ◽  
Gas Sensing Properties ◽  
Mesoporous Zno ◽  
Sensing Performance

We successfully deposited a three dimensional (3D) mesoporous ZnO nanostructure on a glass substrate by using a hydrothermal method, and tested the material for its gas sensing performance.

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