Graphene, mechanically exfoliated as a single-atom-thick two-dimensional (2D) material, is renowned for its exceptional carrier mobility and mechanical strength, making it a highly promising material for a wide range of applications; however, following the synthesis of large-area, high-quality graphene, quality degradation, such as tearing, frequently occurs during the transfer process. Currently, chemical vapor deposition (CVD) enables reliable synthesis of large-area graphene, and both wet and dry transfer methods are widely employed to transfer graphene onto various substrates. This study focuses on the wet transfer method to improve transfer efficiency by optimizing the interfacial adhesion among graphene, the polymethyl methacrylate (PMMA) support layer, and the target substrate. To enhance the efficiency of the wet transfer process, the PMMA concentration and ultraviolet ozone (UVO) treatment time were systematically optimized. As a result, a transfer yield of up to 97.16 % was achieved under optimized conditions consisting of 6 % PMMA concentration and 15 min of UVO exposure. This research contributes to the development of highly efficient graphene transfer techniques, which are crucial for reducing production costs and processing time in a wide range of advanced applications such as electronics, energy storage, biomedical devices, environmental monitoring, and materials science.

Abstract
1. 서 론
2. 실험 방법
    2.1. 게르마늄(Germanium, Ge) 기판 준비
    2.2. CVD를 이용한 그래핀 합성
    2.3. 그래핀 습식 전사
    2.4. PMMA 농도 조절
    2.5. UVO 처리 시간에 따른 표면에너지 변화
    2.6. 전사율 및 그래핀 구조적 특성 분석
3. 결과 및 고찰
    3.1. PMMA 농도에 따른 전사율
    3.2. UVO treatment에 따른 전사율
4. 결 론
Acknowledgement
References
<저자소개>

• 김정빈(국립한밭대학교 신소재공학과) | Jeongbin Kim (Department of Materials Science and Engineering, Hanbat National University, Daejeon 34158, Republic of Korea)
• 채수혁(국립한밭대학교 신소재공학과) | Suhyeok Chae (Department of Materials Science and Engineering, Hanbat National University, Daejeon 34158, Republic of Korea)
• 안동규(국립한밭대학교 신소재공학과) | Donggyu An (Department of Materials Science and Engineering, Hanbat National University, Daejeon 34158, Republic of Korea)
• 박연주(국립한밭대학교 신소재공학과) | Yeonjoo Park (Department of Materials Science and Engineering, Hanbat National University, Daejeon 34158, Republic of Korea)
• 김윤기(국립한밭대학교 신소재공학과) | Yoon-Kee Kim (Department of Materials Science and Engineering, Hanbat National University, Daejeon 34158, Republic of Korea)
• 오용준(국립한밭대학교 신소재공학과) | Yung-Jun Oh (Department of Materials Science and Engineering, Hanbat National University, Daejeon 34158, Republic of Korea)
• 이상엽(국립한밭대학교 신소재공학과, 국립한밭대학교 소재시스템공학과) | Sangyeob Lee (Department of Materials Science and Engineering, Hanbat National University, Daejeon 34158, Republic of Korea, Department of Materials and Manufacturing Engineering, Hanbat National University, Daejeon 34158, Republic of Korea) Corresponding author
• Ashish Arun Patil(국립한밭대학교 소재시스템공학과)
• 정상현(국립한밭대학교 소재시스템공학과) | Sanghyun Jeong (Department of Materials and Manufacturing Engineering, Hanbat National University, Daejeon 34158, Republic of Korea) Corresponding author
• 최준희(성균관대학교 전자전기공학부) | Jun-Hui Choi (Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea)
• 이재현(성균관대학교 전자전기공학부) | Jae-Hyun Lee (Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea)