scholarly journals Synthesis of AG Nanocrystal/Few-Layer Graphite Nanoplatelet Composites

2018 ◽  
Vol 27 (2) ◽  
pp. 096369351802700
Author(s):  
Shasha li ◽  
Nailiang Liu ◽  
Changqing Fang

The present study focuses on improving the combination of graphite nanoplatelet (GNP) with other organic materials without reducing its properties. An Ag nanocrystal was synthesized by electroless plating method under sonication at 40 °C, which was coated densely onto few-layer GNP and hexagon-slice GNP that was found during GNP treatment. Results illustrated that the Ag nanocrystal had uniform grain size and distinct boundary covered onto GNP. The thermal conductivity of the Ag nanocrystal /few-layer GNP (Ag/GNP) composite was superior to that of the GNP material. In addition, the Ag/GNP composite exhibited excellent electrical conductivity.

2007 ◽  
Vol 154 (7) ◽  
pp. E91 ◽  
Author(s):  
Hiroki Uchiyama ◽  
Masato Sone ◽  
Chiemi Ishiyama ◽  
Tatsuro Endo ◽  
Takeshi Hatsuzawa ◽  
...  

2012 ◽  
Vol 501 ◽  
pp. 319-323
Author(s):  
Hasan A. Alwi ◽  
Lay S. Ewe ◽  
Zahari Ibrahim ◽  
Noor B. Ibrahim ◽  
Roslan Abd-Shukor

We report the room temperature thermal conductivity κ and thermal diffusivity α of polycrystalline La0.7Ca0.3-xSrxMnO3 for x = 0 to 0.1. The samples were prepared by heating at 1220 and 1320oC. The insulator-metal transition temperature, TIM and thermal diffusivity increased with Sr content. Phonon was the dominant contributor to thermal conductivity and the electronic contribution was less than 1%. Enhancement of electrical conductivity σ and thermal diffusivity for x ≥ 0.08 was observed in both series of samples. The grain size of the samples (28 to 46 µm) does not show any affect on the thermal and electrical properties.


2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Pornsiri Wanarattikan ◽  
Piya Jitthammapirom ◽  
Rachsak Sakdanuphab ◽  
Aparporn Sakulkalavek

In this work, stoichiometric Sb2Te3 thin films with various thicknesses were deposited on a flexible substrate using RF magnetron sputtering. The grain size and thickness effects on the thermoelectric properties, such as the Seebeck coefficient (S), electrical conductivity (σ), power factor (PF), and thermal conductivity (k), were investigated. The results show that the grain size was directly related to film thickness. As the film thickness increased, the grain size also increased. The Seebeck coefficient and electrical conductivity corresponded to the grain size of the films. The mean free path of carriers increases as the grain size increases, resulting in a decrease in the Seebeck coefficient and increase in electrical conductivity. Electrical conductivity strongly affects the temperature dependence of PF which results in the highest value of 7.5 × 10−4 W/m·K2 at 250°C for film thickness thicker than 1 µm. In the thermal conductivity mechanism, film thickness affects the dominance of phonons or carriers. For film thicknesses less than 1 µm, the behaviour of the phonons is dominant, while both are dominant for film thicknesses greater than 1 µm. Control of the grain size and film thickness is thus critical for controlling the performance of Sb2Te3 thin films.


2005 ◽  
pp. 1013-1018
Author(s):  
Qiang Zeng ◽  
Y. Bayazitoglu ◽  
Jiang Zhu ◽  
Kenneth Wilson ◽  
M. Ashraf Imam ◽  
...  

2016 ◽  
Vol 89 ◽  
pp. 1278-1282 ◽  
Author(s):  
Chang-Hyun Song ◽  
Youngmin Kim ◽  
Byeong-Kwon Ju ◽  
Jong-Woong Kim

2020 ◽  
Vol 209 (1) ◽  
pp. 48-57 ◽  
Author(s):  
Liang Yang ◽  
Dongsheng Zhang ◽  
Xining Zhang ◽  
Aifen Tian ◽  
Xuan Hui ◽  
...  

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