• Image Slideshow
    Here we show that microscale 3D thermoelectric architectures can be fabricated through the direct writing of particle-based thermoelectric inks... the characteristics of (Bi,Sb)2(Te,Se)3-based particle inks are engineered to create colloidal inks with high viscoelasticity and without organic binders, and the inks are directly written into complex architectures... More Info
  • Image Slideshow
    Herein, we propose the design of cellular thermoelectric architectures for efficient and durable power generation, realized by the extrusion-based 3D printing process... We design the optimum aspect ratio of a cuboid thermoelectric leg to maximize the power output and extend this design to the mechanically stiff cellular architectures... More Info
  • Image Slideshow
    Herein, we demonstrate that doping‐induced surface charges of PbTe particles significantly improve the viscoelasticities of the inks without additives, enabling precise shape and dimension engineering of 3D bulk PbTe materials. Moreover, these impurity‐free PbTe inks allow efficient sintering of the 3D‐printed TE materials... More Info
  • Image Slideshow
    Here, we present the intrinsically stretchable, wafer‐scale Ag2S thin films fabricated by a low‐cost and scalable solution process. The fabricated thin film was demonstrated to exhibit the intrinsic mechanical stretchability of the tensile strain of 14.9%. Moreover, we fabricated the RRAM device with a wrinkled Ag2S thin film... More Info
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Nanomaterials Science and Engineering Lab (NSE)

The NSE focus on the development of novel architectured materials in multi-dimensions through programmed assembly or printing of tailored nanoscale building blocks. To this end, we study the chemical strategies to control over physicochemical properties of individual building blocks as well as their many-body interactions. Moreover, we develop new processing to build up designed architectures from nano- or micro-building blocks. Ultimately, we explore the application areas of architectured materials in multiple length scales as electronic and energy materials.


● Our paper entitled "Direct ink writing of three-dimensional thermoelectric microarchitectures" is accepted for publication in Nature Electronics!
● Our paper entitled "Cu2Se Thermoelectric Cellular Architectures for Efficient and Durable Power Generation" is accepted for publication in Nature Communications!
● Our paper entitled "Doping-induced Viscoelasticity in PbTe Thermoelectric Inks for 3D printing of Power-generating Tubes" is accepted for publication in Advanced Energy Materials!
● Our paper entitled "Solution-processed stretchable Ag2S semiconductor thin films for wearable self-powered nonvolatile memory " is accepted in Advanced Materials!
● Soyoung Cho won the Bronze Prize at the 27th Humantech Paper Award!
● Our paper entitled "Multimaterial 3D Printing of compositionally segmented BiSbTe materials for high performance power generation" is accepted in Nano Energy!
● Our paper entitled by "Colloidal suprastructures self-organised from oppositely-charged all-inorganic nanoparticles " is accepted in Chemistry of Materials!
● Our paper entitled by "Thiometallate precursors for the synthesis of supported Pt and PtNi nanoparticle electrocatalysts: Size-focusing by S capping" is accepted in Nanoscale.
● Fredrick Kim won the best poster award in MCARE 2019 (Title : 3D printing of shape-conformable thermoelectric materials using all-inorganic Bi2Te3-based inks).
● Fredrick Kim won the best poster award in ICT / ACT 2019 (Title : Rheological design of 3D printable all-inorganic inks using BiSbTe-based thermoelectric materials).
● Our paper entitled by "Polyphosphide Precursor for Low-Temperature Solution-Processed Fibrous Phosphorus Thin Films" is accepted in Chemistry of Materials.
● Our paper entitled by "Soluble Telluride-Based Molecular Precursor for Solution-Processed Flexible Thermoelectrics" is accepted in ACS Applied Energy Materials.
● The updated homepage is now open!