Publications

• SCI(E) journal publications (Main author)

A15.

Yoonsang Ra*, Dongjun Kim*, Mi Song Nam*, Sumin Cho, Yu-seop Kim, Seongwoo Cho, Sunmin Jang, Donghan Lee, Jumyung Um**, Yun Jung Heo**, and Dongwhi Choi**. “Electrical grid-independent machine learning-assisted wearable gait analysis device with triboelectric-electromagnetic hybrid energy harvester” Biosensors and Bioelectronics 288 (2025): 117766.

A14.

Yoonsang Ra*, Minjun Song*, Donghan Lee*, Sunmin Jang, Yu-seop Kim, Joonmin Chae, Sumin Cho, Dongik Kam, Donghyun Lee, Gibeom Lee, Younghoon Lee**, and Dongwhi Choi**. “Recent progress in triboelectric platforms: Engineering materials to industrial applications from the perspective of manufacturing” International Journal of Extreme Manufacturing 7 (2025): 032007.

A13.

Thien Trung Luu*, Hai Anh Thi Le*, Yoonsang Ra*, Teklebrahan Gebrekrstos Weldemhret, Hwiyoung Kim, Kyungwho Choi, Dongwhi Choi**, Dukhyun Choi**, and Yong Tae Park**. “Recovered graphene-hydrogel nanocomposites for multi-modal human motion recognition via optimized triboelectrification and machine learning” Composites Part B: Engineering 291 (2025): 111997.

A12.

Yoonsang Ra*, Dongik Kam, Sunmin Jang, Sumin Cho, Donghan Lee, and Dongwhi Choi**. “Sedimentation-driven One-step fabrication of Bifunctional Single-layered Triboelectric Nanogenerator from Sol-state Composite Precursor” Friction 13 (2025): 9440918.

A11.

Yoonsang Ra*, Yu-seop Kim*, Donghan Lee, and Dongwhi Choi**. “Hidden Regulator-based Rotational Triboelectric Nanogenerator with Tracing Optimal Working Condition” International Journal of Mechanical Sciences 276 (2024): 109412.

A10.

Yoonsang Ra*, Jong Woo Kim*, Ilhwan You, Sunmin Jang, Sumin Cho, Girak Gwon, Dongik Kam, Donghan Lee, Awais Ahmad, Mohammad Rezaul Karim, Seung-Jung Lee**, and Dongwhi Choi**. “Direct electrospinning of reconstructable PVDF-TrFE nanofibrous mat onto conductive cement nanocomposite for triboelectricity-assisted net zero energy structure” Chemical Engineering Journal 485 (2024): 149662.

A9.

Yoonsang Ra*, Yu-seop Kim*, Seonmo Yang, Namgyu Kang, Gyuwon Oh, Chungyeon Cho**, Sangmin Lee**, and Dongwhi Choi**. "Portable Triboelectric-Electromagnetic Hybrid Biomechanical Energy Harvester for Driving Various Functional Light-Emitting Diodes with a Wide Range of Wavelengths." Nano Energy 119 (2024): 109052.

A8.

Yoonsang Ra*, Jong Hyun Lee*, Jiho Bang, Donghan Lee, Dongik Kam, Sumin Cho, Sunmin Jang, Donghyeon Yoo, Jong Woo Kim, Kyoung Je Cha**, and Dongwhi Choi**. "Toward Commercialization of Mechanical Energy Harvester: Reusable Triboelectric Nanogenerator Based on Closed-Loop Mass Production of Recyclable Thermoplastic Fluoropolymer with Microstructures." International Journal of Energy Research 2023 (2023): 6919663.

A7.

Yoonsang Ra*, Jaehyoung Kim*, Hyeonsu Kim, Sumin Cho, Donghan Lee, Sunmin Jang, Dongik Kam, Moonwoo La**, Sung Jea Park**, and Dongwhi Choi**. "Smart Conveyor Roller System for Self-Powered Product Size Identification in Electrically Off-Grid Condition Via Hybridization of Triboelectric-Electromagnetic Generators." Nano Energy 100 (2022): 107447.

A6.

Minchang Kim*, Yoonsang Ra*, Sumin Cho, Sunmin Jang, Dongik Kam, Yeongcheol Yun, Hyeonsu Kim, and Dongwhi Choi**. "Geometric Gradient Assisted Control of the Triboelectric Effect in a Smart Brake System for Self-Powered Mechanical Abrasion Monitoring." Nano Energy 89 (2021): 106448.

A5.

Yoonsang Ra*, Ilhwan You*, Minchang Kim, Sunmin Jang, Sumin Cho, Dongik Kam, Seung-Jung Lee**, and Dongwhi Choi**. "Toward Smart Net Zero Energy Structures: Development of Cement-Based Structural Energy Material for Contact Electrification Driven Energy Harvesting and Storage." Nano Energy 89 (2021): 106389.

A4.

Jun Hyuk Choi*, Yoonsang Ra*, Sumin Cho, Moonwoo La**, Sung Jea Park**, and Dongwhi Choi**. "Electrical Charge Storage Effect in Carbon Based Polymer Composite for Long-Term Performance Enhancement of the Triboelectric Nanogenerator." Composites Science and Technology 207 (2021): 108680.

A3.

Yoonsang Ra*, Moonwoo La*, Sumin Cho, Sung Jea Park**, and Dongwhi Choi**. "Scalable Batch Fabrication of Flexible, Transparent and Self-Triggered Tactile Sensor Array Based on Triboelectric Effect." International Journal of Precision Engineering and Manufacturing-Green Technology 8 (2021): 519-531.

A2.

Yoonsang Ra*, Jun Hyuk Choi*, Seung-Jun Choi, Moonwoo La, Sung Jea Park, Moon-Jo Kim**, and Dongwhi Choi**. "Cold Rolled Robust Metal Assisted Triboelectric Nanogenerator for Extremely Durable Operation." Extreme Mechanics Letters 40 (2020): 100910.

A1.

Yoonsang Ra*, Seungin Oh, JoonHo Lee, Yeongcheol Yun, Sumin Cho, Jun Hyuk Choi, Sunmin Jang, Hee Jae Hwang, Dukhyun Choi, Jin-Gyun Kim**, and Dongwhi Choi**. "Triboelectric Signal Generation and Its Versatile Utilization During Gear-Based Ordinary Power Transmission." Nano Energy 73 (2020): 104745.

• SCI(E) journal publications (Co-author)

B14.

Dong-eun Kim*, Yoonsang Ra, Yu Min Lee, Akendra Singh Chabungbam, Chaeseon Hong, Minjae Kim, Hong-Sub Lee**, Dongwhi Choi**, and Hyung-Ho Park**. “Fully self-powered memristor crossbar array with pressure-driven multilevel switching and pattern encoding” Nano Energy 146 (2025): 111497. 

B13.

Dongik Kam*, Girak Gwon*, Yoonsang Ra, Donghan Lee, Yu-seop Kim, Joonmin Chae, Jong Woo Kim, and Dongwhi Choi**. “Mechanically guided 4D printing of a triboelectricity-driven acoustic transducer for self-powered and intelligent voice recognition” npj Flexible Electronics 9 (2025): 73.

B12.

Donghan Lee*, Sumin Cho*, Yu-seop Kim*, Yungeon Jang, Donggeun Oh, Yoonsang Ra, Sunmin Jang, Seonghun Hwang, Joonmin Chae, Kyungwho Choi**, and Dongwhi Choi**. “A Self-Adaptive Triboelectric-Electromagnetic Hybrid Wind Energy Harvester for Sustainable Air Quality Control and Environmental Monitoring” Nano Energy 140 (2025): 110996.

B11.

Sumin Cho*, Muhammad Ramzan Khawar*, Yoonsang Ra, Sunmin Jang, Donghan Lee, Dongik Kam, Soban Ali Shah, Donghyeon Yoo, Yasir Javed, Awais Ahmad, Younghoon Lee, Hee Jae Hwang, Chengkuo Lee**, and Dongwhi Choi**. “Advances in 3D-printed triboelectric nanogenerators and supercapacitors for self-sustainable energy systems” Materials Today 85 (2025): 189-211.

B10.

Sunmin Jang*, Sangeun Lee, Soban Ali Shah, Sumin Cho, Yoonsang Ra, Gibeom Lee, Younghoon Lee**, and Dongwhi Choi**. “Hydrogel-Based Droplet Electricity Generators: Intrinsically Stretchable and Transparent for Seamless Integration in Diverse Environments” Advanced Functional Materials 35 (2024): 2411350.

B9.

Sunmin Jang*, Soban Ali Shah*, Jaehyun Lee, Sumin Cho, Dongik Kam, Yoonsang Ra, Donghan Lee, Muhammad Ramzan Khawar, Donghyeon Yoo, Awais Ahmad, and Dongwhi Choi**. "Beyond Metallic Electrode: Spontaneous Formation of Fluidic Electrodes from Operational Liquid in Highly Functional Droplet‐Based Electricity Generator." Advanced Materials 36 (2024): 2403090.

B8.

Jaba Roy Chowdhury*, Kiran Peringeth*, Anindita Ganguly, Sydney Rechie S. Necesario, Wu-Chiao Hsieh, Yoonsang Ra, Dongwhi Choi**, and Zong-Hong Lin**. "Glycated hemoglobin (HbA1c) and biofluid-based diagnosis in diabetes: A comprehensive review." Journal of Electroanalytical Chemistry 963 (2024): 118301.

B7.

Donghan Lee*, Sumin Cho*, Sunmin Jang, Yoonsang Ra, Yungeon Jang, Yeongcheol Yun, and Dongwhi Choi**. "Toward Effective Irregular Wind Energy Harvesting: Self-Adaptive Mechanical Design Strategy of Triboelectric-Electromagnetic Hybrid Wind Energy Harvester for Wireless Environmental Monitoring and Green Hydrogen Production." Nano Energy 102 (2022): 107638.

B6.

Sunmin Jang*, Yoonsu Joung*, Hyeonsu Kim, Sumin Cho, Yoonsang Ra, Minchang Kim, Dahoon Ahn**, Zong-Hong Lin**, and Dongwhi Choi**. "Charge Transfer Accelerating Strategy for Improving Sensitivity of Droplet Based Triboelectric Sensors Via Heterogeneous Wettability." Nano Energy 97 (2022): 107213.

B5.

Sumin Cho*, Zahid Hanif*, Yeongcheol Yun, Zeeshan Ahmad Khan, Sunmin Jang, Yoonsang Ra, Zong-Hong Lin, Moonwoo La**, Sung Jea Park**, and Dongwhi Choi**. "Triboelectrification-Driven Microbial Inactivation in a Conductive Cellulose Filter for Affordable, Portable, and Efficient Water Sterilization." Nano Energy 88 (2021): 106228.

B4.

Yeongcheol Yun*, Moonwoo La*, Sumin Cho, Sunmin Jang, Jun Hyuk Choi, Yoonsang Ra, Dongik Kam, Sung Jea Park**, and Dongwhi Choi**. "High Quality Electret Based Triboelectric Nanogenerator for Boosted and Reliable Electrical Output Performance." International Journal of Precision Engineering and Manufacturing-Green Technology 8 (2021): 125-137.

B3.

Sumin Cho*, Yeongcheol Yun, Sunmin Jang, Yoonsang Ra, Jun Hyuk Choi, Hee Jae Hwang, Dukhyun Choi, and Dongwhi Choi**. "Universal Biomechanical Energy Harvesting from Joint Movements Using a Direction-Switchable Triboelectric Nanogenerator." Nano Energy 71 (2020): 104584.

B2.

Seonbeen Choi*, Sumin Cho*, Yeongcheol Yun, Sunmin Jang, Jun Hyuk Choi, Yoonsang Ra, Moonwoo La, Sung Jea Park**, and Dongwhi Choi**. "Development of a High‐Performance Handheld Triboelectric Nanogenerator with a Lightweight Power Transmission Unit." Advanced Materials Technologies 5 (2020): 2000003.

B1.

Sunmin Jang*, Moonwoo La*, Sumin Cho, Yeongcheol Yun, Jun Hyuk Choi, Yoonsang Ra, Sung Jea Park**, and Dongwhi Choi**. "Monocharged Electret Based Liquid-Solid Interacting Triboelectric Nanogenerator for Its Boosted Electrical Output Performance." Nano Energy 70 (2020): 104541.

• Patents

C10.

“Triboelectric Generator Using Rainwater”
Seung-Jung Lee, Dongwhi Choi, Yoonsang Ra
Korea, Patent Registration (Registration No. 10-2760664)

C9.

“Polymer Composite Film Using Spontaneous Layer Separation And Touch Position Sensor Based On The Polymer Composite Film”
Dongwhi Choi, Yoonsang Ra, Jiho Bang
Korea, Patent Registration (Registration No. 10-2735876)

C8.

“Fully Self-Powered Smart Conveyor Roller System for Automatic Product Size Identification via Hybridization of Triboelectric-Electromagnetic Generators”
Dongwhi Choi, Yoonsang Ra, Donghan Lee, Sunmin Jang, Dongik Kam, Sumin Cho
Korea, Patent Registration (Registration No. 10-2704281)

C7.

“Water Tank Of Tributing Reservoir Triboelectric Generatable”
Seung-Jung Lee, Dongwhi Choi, Yoonsang Ra
Korea, Patent Registration (Registration No. 10-2653296)

C6.

“Powerless Portable Water Purifier Using Conductive Membrane Electroporation”
Dongwhi Choi, Sumin Cho, Sunmin Jang, Yoonsang Ra
Korea, Technology Transferred (Registration No. 10-2567966)

C5.

“Brake Device”
Dongwhi Choi, Minchang Kim, Yoonsang Ra, Sumin Cho, Jun Hyuk Choi, Yeongcheol Yun, Dongik Kam, Sunmin Jang
Korea, Patent Registration (Registration No. 10-2534793)

C4.

“Gear Monitoring System And Method”
Dongwhi Choi, Jin-Gyun Kim, Yoonsang Ra, Seungin Oh, JoonHo Lee
Korea, Patent Registration (Registration No. 10-2267742)

C3.

“Portable Droplet Spray Device”
Dongwhi Choi, Yun Jung Heo, Jun Hyuk Choi, Yoonsang Ra
Korea, Technology Transferred (Registration No. 10-2248221)

C2.

“Hybrid Droplet-Based Electricity Generator And Method Of Operation”
Dongwhi Choi, Soban Ali Shah, Sunmin Jang, Sumin Cho, Yoonsang Ra
Korea, Patent Application

C1.

“Liquid Electrode-Based Droplet-Based Electricity Generator And Its Operating Method”
Dongwhi Choi, Soban Ali Shah, Sunmin Jang, Sumin Cho, Dongik Kam, Yoonsang Ra, Donghan Lee
Korea, Patent Application