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제123회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Fabrication of porous gold nanoshells via nanosecond-laser irradiation

2019년 1월 15일 11시 12분 29초
PHYS.P-78 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 19일 (금요일) 11:00~12:30
Physical Chemistry
저자 및
Tae-Hyeon Park, Du-Jeon Jang*
Department of Chemistry, Seoul National University, Korea
Needs for new synthetic methods to fabricate diverse gold nanostructures have increased rapidly. In addition to wet-chemical synthesis, pulse-laser irradiation can be a promising approach to fabricate gold nanostructures with unique morphologies and superior properties to meet the needs. Indeed, controlled heating of gold nanostructures with a laser in the femtosecond or picosecond regime has been developed with detailed calculations. In the meantime, nanosecond lasers have been exploited in limited ways due to their slow pulse duration times, which make the controlled heating difficult. Here, we demonstrate a use of a nanosecond laser to acquire desired gold nanostructures. With the help of silica nanotemplates, hollow and porous gold nanoshells (HPA NSs) were fabricated via pulse-laser irradiation. The synthetic strategy mainly relies on the surface melting of gold nanoparticles induced by nanosecond-laser irradiation. Bonds among the gold nanoparticles are formed following the surface melting, and the bonds make it possible for the gold nanostructures to preserve their structure after the removal of the silica nanotemplates. The HPA NSs exhibited high SERS efficiency for the detection of methylene blue due to their high surface area. Thus, we consider that HPA NSs fabricated via laser irradiation can be utilized for the detection of molecules, and our synthetic strategy suggests a new extensibility of nanosecond lasers for the fabrication of gold nanostructures with unique morphologies.