Article
Chemistry, Physical
Go-Eun Lee, Il-Ho Kim
Summary: This study evaluated the effects of mechanical alloying and hot-pressing conditions on the Cu3SbSe4 phase and its thermoelectric properties, finding that the electrical conductivity decreased with increasing hot-pressing temperature, while the Seebeck coefficient increased. At 623K, the power factor ranged from 0.38 to 0.50 mW m(-1) K(-2), and the thermal conductivity was between 0.76 and 0.78 W m(-1) K(-1).
Article
Materials Science, Multidisciplinary
Go-Eun Lee, Il-Ho Kim
Summary: This study investigated the optimal processing conditions for the synthesis of Cu3SbSe3 and found that the mechanical alloying method produced powder with an orthorhombic Cu3SbSe3 phase. However, secondary phases of permingeatite (Cu3SbSe4) and berzelianite (Cu1.78Se) were also identified. The hot pressing method resulted in dense compacts with a high relative density, and the specimens exhibited good thermoelectric properties with low thermal conductivity and high figure of merit ZT.
KOREAN JOURNAL OF METALS AND MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Go-Eun Lee, Il-Ho Kim
Summary: This study investigated the optimal conditions for the synthesis of Cu3SbS3 through mechanical alloying and hot pressing, and evaluated its thermoelectric properties. The results indicated that skinnerite prepared under the optimal conditions exhibited a high thermoelectric performance.
KOREAN JOURNAL OF METALS AND MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Se-In Jeong, Il-Ho Kim
Summary: Ge-doped tetrahedrites Cu12Sb4-yGeyS13 (y = 0.1-0.4) were prepared using mechanical alloying and hot pressing. Ge substitution at the Sb sites resulted in decreased lattice constant, decreased electrical conductivity, and increased Seebeck coefficient. The power factor decreased with increasing Ge content, while the thermal conductivities decreased significantly. This study highlights the best thermoelectric performance when the Ge content was 0.2.
KOREAN JOURNAL OF METALS AND MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ho-Jeong Kim, Il-Ho Kim
Summary: In this study, Cu3Sb1-y(Al/In)ySe4 doped with BIII-group elements (Al or In) at the Sb sites was successfully synthesized. The resulting material exhibited a high density and a single tetragonal crystal structure. The substitution of Al/In at the Sb sites increased the carrier concentration, resulting in improved electrical and thermal conductivities.
KOREAN JOURNAL OF METALS AND MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Sung-Gyu Kwak, Go-Eun Lee, Il-Ho Kim
Summary: Tetrahedrite Cu12Sb4S13, composed of non-toxic components, shows low thermal conductivity at intermediate temperatures and has potential as a thermoelectric material. Doping with Se can optimize carrier concentration and enhance power factor, while reducing thermal conductivity through additional phonon scattering. Increasing Se substitution leads to decreased carrier concentration, increased mobility, lower electrical conductivity, higher Seebeck coefficient, and reduced thermal conductivity in Se-doped tetrahedrites.
ELECTRONIC MATERIALS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
V. Cebotari, F. Popa, T. F. Marinca, B. V. Neamtu, N. A. Sechel, M. Galatanu, A. Galatanu, I. Chicinas
Summary: Mg2Si thermoelectric compound was successfully obtained by both dry and wet mechanical alloying methods. Wet milling with benzene resulted in smaller particle sizes and improved thermoelectric properties, including a higher Seebeck coefficient and lower electrical conductivity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
M. Prashanth, R. Karunanithi, S. Sivasankaran, Luis Perez Villarejo
Summary: This study investigates the influence of the volume percentage of Al2O3 and milling time on the morphology, phase formation, and mechanical behavior of nanocomposites. The results show that the nanocomposite samples reinforced with 10 vol% Al2O3 exhibit higher hardness and compressive stress compared to those reinforced with 5 vol% Al2O3 and 20 vol% Al2O3. Additionally, the contribution of the strengthening mechanism to the total strength of the specimen was studied for different milling times of the 10 vol% Al2O3 reinforcement.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Ji-Hee Pi, Go-Eun Lee, Il-Ho Kim
Summary: Research on Ge-doped famatinites reveals that Ge doping can increase the carrier concentration and mobility, thus enhancing the thermoelectric properties of the specimens. Compared to undoped samples, Ge-doped specimens exhibit superior thermoelectric performance.
ELECTRONIC MATERIALS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Min-Cheol Kwon, Il-Ho Kim
Summary: The Si content in Si-doped Cu12Sb4-ySiyS13 compounds significantly affects their thermoelectric properties, with different trends in the Seebeck coefficient and electrical conductivity as the Si content increases. The solubility limit of Si was determined to be y = 0.3. The highest power factor was achieved at y = 0.2, and the lowest thermal conductivity was observed at y = 0.3.
KOREAN JOURNAL OF METALS AND MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hee-Jae Ahn, Il-Ho Kim
Summary: In this study, tetrahedrite compounds doped with Sn were successfully prepared and analyzed for their charge transport and thermoelectric properties. The results showed that increasing Sn content led to higher Seebeck coefficient and power factor, but lower electrical conductivity. Additionally, Sn substitution was found to reduce both electronic and lattice thermal conductivities.
KOREAN JOURNAL OF METALS AND MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Temel Varol, Onur Guler, Serhatcan Berk Akcay, Hamza Colak
Summary: The effects of mechanical alloying (MA) time and Cr content (wt%) on the microstructure, density and hardness, electrical conductivity and oxidation resistance of Cu-Cr alloys were investigated. The results showed that increasing MA time and Cr content led to higher hardness and density, while Cu-Cr alloys with 0.5 wt% Cr alloyed for 4 h exhibited the optimum electrical conductivity.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Heming Huang, Pengfei Wen, Shu Deng, Xilong Zhou, Bo Duan, Yao Li, Pengcheng Zhai
Summary: High-performance thermoelectric materials can be achieved through an effective and convenient preparation method combining one-step solid state reaction (SSR) with hot pressing (HP), which can produce compact samples with an anti-fluorite structure by controlling the HP temperature. The obtained Mg-2(Si0.3Sn0.7)(0.99)Sb-0.01 shows a decent figure of merit and flexural strength, comparable to samples prepared by more complicated methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Sung-Gyu Kwak, Go-Eun Lee, Il-Ho Kim
Summary: Tetrahedrite is a promising thermoelectric material with low thermal conductivity due to its complex crystal structure, requiring carrier concentration optimization through doping to maximize the power factor. Te-doped tetrahedrites exhibit p-type characteristics with changing electrical properties at different Te content levels. A high figure of merit and power factor were achieved in Cu12Sb3.9Te0.1S13, showing potential for thermoelectric applications.
KOREAN JOURNAL OF METALS AND MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
E. Symeou, M. Karyou, A. Delimitis, M. Constantinou, G. Constantinides, Ch Nicolaou, I Giapintzakis, Th Kyratsi
Summary: In this study, Bi-doped Mg2Si0.55-xSn0.4Gex (x = 0 and 0.05) materials were prepared by mechanical alloying combined with hot press sintering to enhance the mass capabilities of their synthesis route. The optimum thermoelectric properties were achieved for Mg2Si0.57Sn0.4Bi0.03 and Mg2Si0.53Sn0.4Ge0.05Bi0.02 compositions with maximum figure of merit (ZT) values of 1.07 and 1.2, respectively, after ball milling for 32 hours.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Engineering, Electrical & Electronic
Ji-Hee Pi, Go-Eun Lee, Il-Ho Kim
JOURNAL OF ELECTRONIC MATERIALS
(2020)
Article
Engineering, Electrical & Electronic
Ji-Hee Pi, Go-Eun Lee, Il-Ho Kim
JOURNAL OF ELECTRONIC MATERIALS
(2020)
Article
Nanoscience & Nanotechnology
Minh Canh Vu, Il-Ho Kim, Won Kook Choi, Choong-Sun Lim, Md Akhtarul Islam, Sung-Ryong Kim
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Materials Science, Multidisciplinary
Sung-Gyu Kwak, Ji-Hee Pi, Go-Eun Lee, Il-Ho Kim
KOREAN JOURNAL OF METALS AND MATERIALS
(2020)
Article
Engineering, Electrical & Electronic
A. K. M. Ashiquzzaman Shawon, Il-Ho Kim, Soon-Chul Ur
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2020)
Article
Materials Science, Multidisciplinary
Sung-Gyu Kwak, Go-Eun Lee, Il-Ho Kim
Summary: Tetrahedrite Cu12Sb4S13, composed of non-toxic components, shows low thermal conductivity at intermediate temperatures and has potential as a thermoelectric material. Doping with Se can optimize carrier concentration and enhance power factor, while reducing thermal conductivity through additional phonon scattering. Increasing Se substitution leads to decreased carrier concentration, increased mobility, lower electrical conductivity, higher Seebeck coefficient, and reduced thermal conductivity in Se-doped tetrahedrites.
ELECTRONIC MATERIALS LETTERS
(2021)
Article
Chemistry, Physical
Go-Eun Lee, Il-Ho Kim
Summary: This study evaluated the effects of mechanical alloying and hot-pressing conditions on the Cu3SbSe4 phase and its thermoelectric properties, finding that the electrical conductivity decreased with increasing hot-pressing temperature, while the Seebeck coefficient increased. At 623K, the power factor ranged from 0.38 to 0.50 mW m(-1) K(-2), and the thermal conductivity was between 0.76 and 0.78 W m(-1) K(-1).
Article
Materials Science, Multidisciplinary
Ji-Hee Pi, Go-Eun Lee, Il-Ho Kim
Summary: Research on Ge-doped famatinites reveals that Ge doping can increase the carrier concentration and mobility, thus enhancing the thermoelectric properties of the specimens. Compared to undoped samples, Ge-doped specimens exhibit superior thermoelectric performance.
ELECTRONIC MATERIALS LETTERS
(2021)
Article
Physics, Multidisciplinary
Sung-Gyu Kwak, Il-Ho Kim
Summary: The thermoelectric properties of off-stoichiometric tetrahedrite Cu12+mSb4S13 were investigated, and it was found that Cu deficiency improved electrical transport but had a negative effect on thermal transport, while Cu excess reduced thermal conductivity.
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Go-Eun Lee, Il-Ho Kim
Summary: In this study, solid solutions of Cu3SbS4-ySey were synthesized using MA and HP. It was found that the increase in Se content led to higher carrier concentration and mobility, while the Seebeck coefficient decreased. The power factor of the solid solutions did not improve compared with the end compounds. The solid solutions showed lower lattice thermal conductivities with increasing Se content.
KOREAN JOURNAL OF METALS AND MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Min-Cheol Kwon, Il-Ho Kim
Summary: The Si content in Si-doped Cu12Sb4-ySiyS13 compounds significantly affects their thermoelectric properties, with different trends in the Seebeck coefficient and electrical conductivity as the Si content increases. The solubility limit of Si was determined to be y = 0.3. The highest power factor was achieved at y = 0.2, and the lowest thermal conductivity was observed at y = 0.3.
KOREAN JOURNAL OF METALS AND MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Md Mahmudur Rahman, Il-Ho Kim, Soon-Chul Ur
Summary: This study investigates the improvement of thermoelectric properties of Zintl phase magnesium antimonide (Mg3Sb2) by tin doping. P-type Mg3Sb2 was synthesized and its thermoelectric properties were evaluated along with the transport properties.
KOREAN JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Hee-Jae Ahn, Il-Ho Kim
Summary: In this study, Cu3Sb(1-x-y)Sn(x)BiySe(4) doped with Sn and Bi was synthesized through mechanical alloying and subsequently hot pressing. The doping of Sn and Bi affected the electrical and thermal properties of the material, with Cu3Sb0.92Sn0.06Bi0.02Se4 exhibiting the highest electrical conductivity.
KOREAN JOURNAL OF METALS AND MATERIALS
(2022)
Article
Physics, Multidisciplinary
Sang Jun Park, Il-Ho Kim
Summary: In this study, Sn and Se-doped famatinite materials were synthesized and their electrical and thermoelectric properties were evaluated. Double doping with Sn and Se increased the electrical conductivity, power factor, and thermoelectric figure of merit ZT of the materials. The optimized material showed a 4.8-fold enhancement in thermoelectric performance compared to undoped famatinite.
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2023)
Article
Materials Science, Composites
Dineshkumar Mani, Minh Canh Vu, Sebastian Anand, Jun-Beom Kim, Tae-Hyeong Jeong, Il-Ho Kim, Bong Kuk Seo, Md Akhtarul Islam, Sung-Ryong Kim
Summary: This study proposes a stretching-induced filler alignment method to improve the thermal conductivity and electromagnetic interference shielding effectiveness of self-healing polyurethane composites with liquid metal. The alignment of the filler improves the transmission of electrons and phonons, allowing for multiple reflections and absorption of electromagnetic waves, thereby enhancing the performance of the composites.
COMPOSITES COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Honggyun Kim, Jamal Aziz, Vijay D. Chavan, Deok-kee Kim
Summary: Silicon nitride films were prepared using plasma enhanced chemical vapor deposition with different trap densities induced by adjusting the RF power ratio. It was found that the film's trap density was lowest under compressive stress and increased under tensile stress. This study has significant implications for the formation of durable nitride films in various electronic and optoelectronic applications.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Qiang Yu, Huwei Zhao, Yue Zhao
Summary: Zinc oxide thin films and Al-doped zinc oxide films were prepared and characterized in this study. The addition of Al ions was found to change the growth orientation, increase the grain size, and enhance the absorption intensity in the visible light region. Furthermore, the addition of Al ions also increased the forward current in the heterojunction.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Sang Woo Lee, Min Sun Park, Sangwon Wi, So Yeon Lim, Yeseul Lee, Jin-Seok Chung, Sang Mo Yang
Summary: In this study, we investigated the dynamics of domain switching in pristine and fatigued BiFeO3 capacitors through experimental observations and measurements. The results showed that the switching in the pristine capacitors was dominantly driven by domain growth, while the fatigued capacitors exhibited two different switching dynamics, in which nucleation played a critical role.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Boshi Wang, Tianyi Wang, Yufang Liu, Kun Yu
Summary: In this paper, a tunable and anisotropic perfect absorber composed of anisotropic black phosphorus (BP) and isotropic graphene is proposed. The structure exhibits high absorption and strong anisotropic plasma response. The resonance characteristics can be effectively controlled by adjusting geometric parameters and doping levels, offering potential applications.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Xiaolan Liu, Chunyang Li, Tonghui Yang, Naiqiang Yin, Gangling Zhao
Summary: Water drop triboelectric nanogenerators (WD-TENGs) can harvest energy from raindrops and improve the output performance of TENGs.
CURRENT APPLIED PHYSICS
(2024)