NPG Asia Materials
To achieve a fast and efficient thermoresponsive color change, raspberry-shaped plasmonic microgels were fabricated by decorating gold nanoparticles (AuNPs) on poly(N-isopropylacrylamide) (PNIPAM) microgels, which exhibit reversible and strain-insensitive color shifts (between red and grayish violet) in response to a temperature change.
Science Advances
Nanomembranes and nanowires build tiny, transparent loudspeakers and sensitive, voice-recognition microphones that attach to skin
Advanced Materials
Improved performance in plasmonic organic solar cells (OSCs) and organic light-emitting diodes (OLEDs) via strong plasmon-coupling effects generated by aligned silver nanowire (AgNW) transparent electrodes decorated with core–shell silver–silica nanoparticles (Ag@SiO 2 NPs) is demonstrated
ACS Nano
Inspired by skin structure and function, we fabricate hierarchical nanoporous and interlocked microridge structured polymers with gradient stiffness for spacer-free, ultrathin, and highly sensitive triboelectric sensors (TESs). The proposed design of hierarchical polymer architectures for the flexible and wearable TESs can find numerous applications in next-generation wearable electronics.
ACS Nano
Here, we demonstrate a flexible ferroelectric sensor with ultrahigh pressure sensitivity and linear response over an exceptionally broad pressure range based on the material and structural design of ferroelectric composites with a multilayer interlocked microdome geometry.
NPG Asia Materials
In this study, we present piezoresistive electronic skins with tunable force sensitivity and selectivity to multidirectional forces by engineering microstructure geometries (dome, pyramid, pillar). Depending on shape of microstructures, distinct variation in contact area and localized stress under multidirectional stresses (normal, shear, tensile, bending) provides different sensitivity, selectivity, response/relaxation time, and mechanical stability.
ACS Nano
Flexible, transparent, and force-sensitive touch screens using cross-aligned AgNW electrodes integrated with mechanochromic spiropyran–polydimethylsiloxane composite film. Our force-sensitive touch screens enable the precise monitoring of dynamic writings, tracing and drawing of underneath pictures, and perception of handwriting patterns with locally different writing forces.
Advanced Materials
By mimicking muscle actuation to control cavity-pressure-induced adhesion of octopus suckers, smart adhesive pads are developed in which the thermoresponsive actuation of a hydrogel layer on elastomeric microcavity pads enables excellent switchable adhesion in response to a thermal stimulus (maximum adhesive strength: 94 kPa, adhesion switching ratio: ≈293 for temperature change between 22 and 61 °C).

Functional Nanomaterials and Devices

Our research interests are centered on the development of functional nanomaterials and devices based on the micro- and nanostructures. We are interested in exploiting the fabrication strategies combining “bottom-up” assembly and “top-down” lithography to hierarchically organize organic and inorganic nanomaterials (carbon nanotubes, graphenes, nanowires, nanoparticles, …) on multiple length scales. We also seek to understand the fundamental physical properties of individual nanomaterials and the collective behavior of the organized micro- and nanostructures, which is central to the rational development of functional devices. Ultimately, these micro- and nanostructures may find use in electronics, optics, sensors, and biomedical devices.
Ko lab

News & Achievement

Congratulations for winning the best oral presentation award in 2018 Fall Polymer Society of Korea

Posted on 22 Oct 2018
Jeonghee Yeom won the best oral presentation award in 2018 Fall Polymer Society of Korea.  

Congratulations for winning the WISET-PSK Young Researcher Award in 2018 Fall Polymer Society Korea

Posted on 22 Oct 2018
Minjeong Ha won the WISET-PSK Young Researcher Award in 2018 Fall Polymer Society Korea.

Congratulations for winning the best poster presentation award in IUMRS-ICEM 2018

Posted on 01 Oct 2018
Seungyoung Park won the best poster presentation award in IUMRS-ICEM 2018.

Congratulations for winning the best Poster Paper Award in Nano Korea 2018

Posted on 17 Jul 2018
Ayoung Choe won the best poster award (gold medal) in Nano Korea 2018.

Congratulations for Young Scientist Award (Oral Presentation) in 2018 E-MRS spring meeting

Posted on 16 Jul 2018
Minjeong Ha won a Young Scientist Award (Oral Presentation) in 2018 E-MRS spring meeting (Symposium

Recent Publications

Journal publication: NPG Asia Materials

Posted on 21 Sep 2018
Ayoung Choe, Jeonghee Yeom, Ravi Shanker, Minsoo P. Kim, Saewon Kang, and Hyunhyub Ko*, “Stretchable

Journal publication: Science Advances

Posted on 03 Sep 2018
Saewon Kang, Seungse Cho, Ravi Shanker, Hochan Lee, Jonghwa Park, Doo-Seung Um, Youngoh Lee, and Hyu

Journal publication: Advanced Materials

Posted on 03 Sep 2018
Taehyo Kim, Saewon Kang, Jungwoo Heo, Seungse Cho, Jae Won Kim, Ayoung Choe, Bright Walker, Ravi Sha

Journal publication: ACS Nano

Posted on 17 Apr 2018
Youngoh Lee, Jonghwa Park, Soowon Cho, Young-Eun Shin, Hochan Lee, Jinyoung Kim, Jinyoung Myoung,  S

Journal publication: NPG Asia Materials

Posted on 17 Apr 2018
Jonghwa Park, Jinyoung Kim, Jaehyung Hong, Hochan Lee, Youngoh Lee, Seungse Cho, Sung-Woo Kim, Jae J

Position available

There are several openings for graduate students and researchers in the area of functional nanomaterials and devices. Feel free to contact Prof. Ko (e-mail:, tel: 052-217-2532) if you are interested.