Sorting Gold and Sand (Silica) Using Atomic Force Microscope-Based Dielectrophoresis

• 作者: Chungman Kim Sunghoon Hong Dongha Shin Sangmin An Xingcai Zhang Wonho Jhe
• 来源期刊: 纳微快报（英文版）
• 年，卷（期）: 2022,（2）
• 页码范围: 1-11
• 页数: 11页
• 语种: 英文

摘要

Additive manufacturing-also known as 3D printing-has attracted much attention in recent years as a powerful method for the simple and versatile fabrication of complicated three-dimensional structures.However,the current technology still exhibits a limitation in realizing the selective deposition and sorting of various materials contained in the same reservoir,which can contribute sig-nificantly to additive printing or manufacturing by enabling simultaneous sorting and deposition of different substances through a single nozzle.Here,we propose a dielectrophoresis(DEP)-based material-selective deposition and sorting tech-nique using a pipette-based quartz tuning fork (QTF)-atomic force microscope (AFM) platform DEPQA and demonstrate multi-material sorting through a single nozzle in ambient conditions.We used Au and silica nanoparticles for sorting and obtained 95％ accuracy for spatial separation,which confirmed the surface-enhanced Raman spectroscopy (SERS).To validate the scheme,we also performed a simulation for the system and found qualitative agreement with the experimental results.The method that combines DEP,pipette-based AFM,and SERS may widely expand the unique capabilities of 3D printing and nano-micro patterning for multi-material patterning,materials sorting,and diverse advanced applications.