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Advances in Atomic Force Microscopy for the Electromechanical Characterization of Piezoelectric and Ferroelectric Nanomaterials
Kwanlae Kim
김관래
Korean J. Met. Mater. 2022;60(9):629-643.   Published online 2022 Aug 30
DOI: https://doi.org/10.3365/KJMM.2022.60.9.629

Abstract
Given the social demand for self-powering wearable electronics, it is necessary to develop composite materials that exhibit both good flexibility and excellent piezoelectric performances. Intensive research on synthesis methods and devising characterization techniques for piezoelectric nanomaterials in various forms has been conducted. In particular, characterization techniques for piezoelectric nanomaterials require..... More

                        
Dependency of Conductive Atomic Force Microscopy and Lateral Force Microscopy Signals on Scan Parameters for Zinc Oxide Nanorods
Yijun Yang, Kwanlae Kim
Korean J. Met. Mater. 2022;60(2):149-159.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.149

Abstract
Conductive atomic force microscopy (C-AFM) is one of the most commonly used characterization techniques for piezoelectric one-dimensional nanomaterials. However, a comprehensive understanding of the effects of certain scan parameters on the C-AFM signals remains elusive. In the present work, the dependency of C-AFM signals on the normal force, scan speed,..... More

                        
Sintering Mechanism and Enhanced Piezoelectric and Crystal Structural Properties of (1-x)Ba(Zr<sub>0.2</sub>Ti<sub>0.8</sub>)O<sub>3</sub>-x(Ba<sub>0.7</sub>Ca<sub>0.3</sub>)TiO<sub>3</sub> Lead Free Ceramics
Yoo-Young Oh, Gwangseop Lee, Masao Kamiko, Jung-Hyuk Koh
Korean J. Met. Mater. 2022;60(2):141-148.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.141

Abstract
A lead-free piezoelectric ceramic, (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 (hereafter (1-x)BZT-xBCT), was investigated for functional device applications. Lead-free piezoelectric materials with high piezoelectric charge coefficients and voltage coefficients are indispensable for functional industrial applications. Piezoelectric ceramic specimens tend to shrink in size during the sintering process without melting. This study focused on this phenomenon..... More

                        
A Comparative Study of BaTiO<sub>3</sub>/PDMS Composite Film and a PVDF Nanofiber Mat for Application to Flexible Pressure Sensors
Donghyuck Park, Kwanlae Kim
Korean J. Met. Mater. 2021;59(6):412-421.   Published online 2021 May 26
DOI: https://doi.org/10.3365/KJMM.2021.59.6.412

Abstract
Intensive research has been conducted to develop flexible piezoelectric pressure sensors, since selfpowering devices are advantageous for wearable electronic applications. Recently, two types of piezoelectric devices, ceramic-PDMS composite film and PVDF nanofiber mats, have drawn attention in the research community. Piezoelectric ceramics such as BaTiO3 (BTO) and PZT exhibit outstanding..... More

                           Cited By 2
Evaluation of the Mechanical Properties of ZnO Nanorods Treated with Oxygen Plasma using Atomic Force Microscopy
Donghyuck Park, Yijun Yang, Kwanlae Kim
Korean J. Met. Mater. 2021;59(3):209-216.   Published online 2021 Feb 19
DOI: https://doi.org/10.3365/KJMM.2021.59.3.209

Abstract
Zinc oxide (ZnO) simultaneously exhibits semiconducting and piezoelectric properties. ZnO in the form of nanorods has been studied intensively for application in self-powering devices. The power generation in piezoelectric nanogenerators based on ZnO nanorods can be improved via several approaches, including an oxygen plasma treatment. When ZnO nanorods are exposed..... More

                           Cited By 2
Size Dependency of a ZnO Nanorod-Based Piezoelectric Nanogenerator Evaluated by Conductive Atomic Force Microscopy
전도식 원자현미경을 이용한 ZnO 나노로드 기반 압전 나노발전기의 사이즈 의존성 평가
Yijun Yang, Kwanlae Kim
양이준, 김관래
Korean J. Met. Mater. 2020;58(1):67-75.   Published online 2020 Jan 1
DOI: https://doi.org/10.3365/KJMM.2020.58.1.67

Abstract
ZnO nanorods are one of the most studied materials because it can be facilely grown on a wide range of substrates at low temperature. ZnO exhibits piezoelectricity as well as semiconducting properties, and hence is applicable to piezoelectric nanogenerators and sensors. In the present work, the effect of ZnO nanorods’..... More

                           Cited By 5
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