Host: Hyeon-Ho Jeong / Language: English

Thursday, December 11, 2025, 16:30~

 #206, EECS-B Bldg.

Title: Advancing High-Throughput Manufacturing and Characterization of Metallic Materials 

이희권 박사

Sandia National Laboratories-Center for Integrated Nanotechnologies(CINT)

[Abstract]

Bimetallic nanoparticles offer tunable electronic, catalytic, and optical properties that often surpass those of single-component materials, yet identifying optimal combinations remains challenging due to the multidimensional parameter space of size, composition, structure, and spatial arrangement.

To address this challenge, we developed a high-throughput electrochemical additive manufacturing platform based on scanning probe microscopy, enabling both alloy nanoparticle synthesis and the construction of complex heterostructures.

In the first part, I will discuss controlled electrodeposition of bimetallic nanostructures using scanning electrochemical cell microscopy (SECCM), where programmable reduction potentials and deposition times yield precise variationsin nanoparticle composition and spatial placement.

This approach enables rapid production of materials libraries directly on substrates for systematic screening [1, 2]. I then extend this method to the synthesis of heterostructured architectures, including core–shell and multishell configurations, through nanofluidic control in dual-channel nanopipettes[3]. A voltage bias between channels dynamically regulates the local electrolyte environment, enabling sequential deposition of distinct metals to tailor shell thickness, layer ordering, and interfacial structure within individual nanoparticles.

The resultingadditively manufactured intermetallic and heterostructured nanoparticles are characterized by SECCM for rapid screening of electrocatalytic performance(e.g., hydrogen evolution reaction).

Together, these capabilities establish a versatile scanning probe platform for accelerated discovery in electrocatalysis, providing automated synthesis and high-throughput electrochemical characterization of nanometals.

Please note that I am not representing Sandia in this talk, and no work conducted at SNL-CINT will be discussed due to lab policy.

[Biography]

PROFESSIONAL APPOINTMENTS

Sandia National Laboratories–Center for Integrated Nanotechnologies, New Mexico, United States (Advisor: Dr. Brad L. Boyce)

Postdoctoral Appointee, Nanometallurgy, April 2025 – Mechanics of nanocrystalline metals

The University of Texas at Austin, Texas, United States (Advisor: Dr. Hang Ren)

Postdoctoral Fellow, Electrochemistry,April 2025 - Electrodeposition and catalysis of alloy nanoparticles

EDUCATION