다공성 실리콘 구조를 가진 광학 고분자 리플리카를 이용한 TNT 감지

Abstract

Chapter 1. TNT Sensing of Photonic Polymer Replicas with DBR Structured Silicon Quantum Dots Jeong KyeongMun Advisor : Prof. Sohn, Honglae, Ph.D, Department of Chemistry, Graduate School of Chosun University DBR porous silicon has the property of reducing fluorescence when detec ting explosive vapor and has an excellent quenching effect, so it is used as an explosive detection sensor. However, there is a risk that DBR porous sil icon can be easily damaged by external impact. To complement this, resea rch was conducted using a replica that has flexibility and stability and mai ntains DBR characteristics. DBR porous silicon was made into a film, polymer was casted, and silico n was removed through HF to produce an optical polymer replica. Optical properties were analyzed through reflectivity, and TNT detection efficiency was measured through photoluminescence. Additionally, relative efficiency was achieved through N-type wafer and N-type composite. The fluorescenc e of the N-type composite decreased by 3.6%, while the fluorescence of th e replica decreased by about 18%, showing relatively high TNT detection ef ficiency.

Chapter 2. There are various synthesis methods for silicon quantum dots, and depending on the method, the surface can have various chemical structures such as Si-Cl, Si-H, Si-OH, and Si-R. It can be applied to various purposes by using the characteristics of each surface structure, and experiments were conducted to detect nerve agents, a substance that often causes problems due to terrorism, chemical spills using Si-H quantum dots, and used them as analytes, conducted a nerve agent detection experiment using nerve agent-like substances DMMP, DCP, and TEP. Si-H quantum dots were synthesized by reacting Mg2Si and NH4Cl in THF, and the synthesis was confirmed through FT-IR and Photoluminescence. In addition, in the detection analysis of quantum dots and nerve agents, a decrease in Si-H peak was confirmed through FT-IR, and the decrease in fluorescence was analyzed through photoluminescence. When synthesized with DMMP, fluorescence decreased by about 11.8%, when synthesized with DCP, it decreased by about 18.4%, and when synthesized with TEP, it decreased by about 12%.