Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Core-shell TiO2/Ag Nanoparticle Synthesis and Characterization for Conductive Paste

전도성 페이스트용 코어-쉘 TiO2/Ag 나노입자의 합성 및 특성 연구

  • Sang-Bo, Sim (Changsung Nanotech Co., Ltd.) ;
  • Jong-Dae, Han (School of Smart Green Engineering, Changwon National University)
  • 심상보 (창성나노텍(주)) ;
  • 한종대 (창원대학교 공과대학 스마트그린공학부)
  • Received : 2022.12.18
  • Accepted : 2022.12.29
  • Published : 2023.02.10
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Abstract

Core-shell TiO2/Ag nanoparticles were synthesized by a modified sol-gel process and the reverse micelle method using acetoxime as a reducing agent in water/dodecylbenzenesulfonic acid (DDBA)/cyclohexane. The structure, shape, and size of the TiO2/Ag nanoparticles were investigated using X-ray diffraction (XRD), UV-visible spectroscopy, scanning electron microscope (SEM), transmission electron microscope (TEM), and thermogravimetric analysis (TGA). The size of TiO2/Ag nanoparticles could be controlled by changing the [water]/[DDBA] molar ratio values. The size and the polydispersity of TiO2/Ag nanoparticles increased when the [water]/[DDBA] molar ratio rose. The resultant Ag nanoparticles over the anatase crystal TiO2 nanoparticles exhibited a strong surface plasmon resonance (SPR) peak at about 430 nm. The SPR peak shifted to the red side with the increase in nanoparticle size. Conductive pastes with 70 wt% TiO2/Ag nanoparticles were prepared, and the pastes were coated on the PET films using a screen-printing method. The printed paste films of the TiO2/Ag nanoparticles demonstrated greater surface resistance than conventional Ag paste in the range of 405~630 μΩ/sq.

코어-쉘 TiO2/Ag 나노입자를 수정된 졸-겔 공정과 함께 acetoxime을 환원제로 사용한 물/dodecylbenzenesulfonic acid (DDBA)/cyclohexane의 역 미셀 방법으로 합성하였다. 합성된 TiO2/Ag 나노입자의 구조, 형태 및 크기를 XRD, UV-visible spectroscopy, SEM, TEM 및 TGA를 이용하여 조사하였다. TiO2/Ag 나노입자의 크기는 [물]/[DDBA]의 몰비를 조절하여 제어할 수 있었다. TiO2/Ag 나노입자의 크기와 다분산성은 [물]/[DDBA]의 몰비가 증가함에 따라 증가하였다. 아나타제 결정상의 TiO2 나노입자 위에 생성된 Ag 나노입자는 430 nm 주변에서 강한 표면 플라즈몬 공명(SPR) 흡수 특성을 나타내었다. SPR 피크는 나노입자 크기의 증가에 따라 장파장으로의 적색 이동이 나타났다. 70 wt% 조성으로 TiO2/Ag 나노입자를 분산시켜 전도성 페이스트를 제조하고, 스크린 인쇄법으로 PET 필름에 코팅하여 전도성을 조사하였다. TiO2/Ag 나노입자 페이스트로 코팅된 필름은 상용 Ag 페이스트의 경우보다 높은 405~630 μΩ/sq 영역의 표면저항을 나타내었다.

Keywords

Acknowledgement

이 논문은 2021~2022년도 창원대학교 자율연구과제 연구비 지원으로 수행된 연구결과임.

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