Incorporation of Au nanoparticles into thermoelectric mesoporous ZnO using a reverse triblock copolymer to enhance electrical conductivity

Hong, Min Hee; Han, Wooje; Park, Hyung Ho

doi:10.1016/j.matchemphys.2018.03.077

Cited by 5 publications

(4 citation statements)

References 30 publications

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“…In this paper, the refractive index of ZnO is 2.1 [26], and for ZnO with Au NPs was 2.081. The ratio of ZnO to Au was calculated and estimated [18]. The measured refractive index was 1.629 for pristine ZnO, 1.695 for Au NPs ZnO and 1.652 for Au NPs-AZO.…”

Section: Resultsmentioning

confidence: 99%

“…The formation of hexagonal wurtzite structure for ZnO caused by sol-gel processing and an annealing temperature of 4008C has been reported [24], which is lower than in our experiments. After crystallization, the pore structure could have collapsed as the grain growth progressed, but by doping the ZnO structure with Al, the grain growth was effectively inhibited compared with that of the pristine ZnO thin film [18]. The Al doping affected the mesoporous ZnO structure by preventing the collapse of the pore structure due to the Au NP incorporation and the grain growth in the ZnO skeletal structure, as was evident in the Au NPs-ZnO thin film without the dopant.…”

Section: Cu (Grid)mentioning

confidence: 99%

“…However, the electrical conductivity of the Au NPs-AZO thin film rather increased with a small decrease in the Seebeck coefficient. Of most importance is that the pore structure of the mesoporous ZnO thin film and its intrinsic nature of limiting heat transfer was effectively maintained through the Al doping [18]. It can be said that the thermoelectric properties of Au NP-incorporated mesoporous ZnO thin films were enhanced by the Al doping by minimizing the decrease in the Seebeck coefficient value and improving the pore arrangement while maximizing the increase in electrical conductivity.…”

Section: Cu (Grid)mentioning

confidence: 99%

“…However, the incorporation of Au NPs had a deleterious effect because of pore structural collapse [17,18], so Al was added as a dopant because the Al ions were substituted for Zn ions at the lattice sites. This induced stress in the thin film, which distorted the crystalline structure and as a result, grain growth was inhibited and the pore structure was maintained [19].…”

Section: Introductionmentioning

confidence: 99%

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The thermoelectric properties of Au nanoparticle-incorporated Al-doped mesoporous ZnO thin films

et al. 2019

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Mesoporous Al-doped ZnO thin films incorporated with gold nanoparticles (Au NPs) were synthesized using a sol–gel and evaporation-induced self-assembly process. In this study, the complementary effects of Au NP incorporation and Al doping on the thermoelectric properties of mesoporous ZnO thin films were analysed. The incorporated Au NPs induced an increase in electrical conductivity but a detriment in the pore arrangement of the mesoporous ZnO thin film, which was accompanied by a decrease in porosity. However, the addition of the Al dopant minimized the pore structural collapse because of the inhibition of the grain growth in the ZnO skeletal structure, resulting in the enhancement of the pore arrangement and porosity. When the Au NPs and Al dopant were added at the same time, the degradation in the pore structure was minimized and the electrical conductivity was effectively increased, but the absolute value of the Seebeck coefficient was decreased. However, as a result, the thermoelectric power factor was increased by 2.4 times compared to that of the pristine mesoporous ZnO thin film. It was found that co-introducing the Au NPs and Al doping to the mesoporous ZnO structure was effective in preserving the pore structure and increasing the electric conductivity, thereby enhancing the thermoelectric property of the mesoporous ZnO thin film.

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Section: Resultsmentioning

confidence: 99%

Section: Cu (Grid)mentioning

confidence: 99%

Section: Cu (Grid)mentioning

confidence: 99%