A Synthesis of Silicon Dioxide Nanoparticles for Latent Fingerprints Detection

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สุทธิกานต์ ไชยกุล
ธิติ มหาเจริญ
ศุภวรรณ วิชพันธุ์

Abstract

         This research focuses on the synthesis of silicon dioxide nanoparticles by sol-gel technology, surface modification and the use of luminescent dyes for effective latent fingerprints detection. Firstly, SiO2 nanoparticles (SNPs) were synthesized by tetraethyl orthosilicate as a precursor and ammonium hydroxide as a catalyst. The effect of NH4OH flow rate (0.1-1.0 ml/min) on the particle size of SNPs was investigated. The NH4OH flow rate at 0.2 ml/min was the optimum condition to achieve the maximum yield of SiO2 nanoparticles, as it could synthesized uniform SiO2 nanoparticles, yielding over 86.5%. Then, the researchers conducted surface modification of silicon dioxide nanoparticles using a silane coupling agent with carboxyl silanetriol sodium salt 25% in water, as with different reaction time of 10-60 minutes. Due to surface modification process, the average particle size of modified SNPs was larger. The addition of CES at 60 min showed the optimum condition as the particles were well-dispersed. Next, dye doped SNPs using a rhodamine B were prepared by different three methods to reduce background and increase sharpness of the fingerprints. Finally, the quality of latent fingerprints was detected by depositing dye-modified SNPs on four different surface types. It was found that high-quality patterns of fingerprints were achieved when using dye-modified SNPs prepared from method (3) RB-CES-SNPs. In conclusion, dye-modified SNPs developed from this research have high selectivity and good contrast. Therefore, it is possible to use these nanoparticles in latent fingerprints detection.


 

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How to Cite
ไชยกุล ส., มหาเจริญ ธ., & วิชพันธุ์ ศ. (2019). A Synthesis of Silicon Dioxide Nanoparticles for Latent Fingerprints Detection. Journal of Criminology and Forensic Science, 5(2), 25–41. retrieved from https://so02.tci-thaijo.org/index.php/forensic/article/view/184649
Section
Research Articles

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