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KMID : 0385520100230020216
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Analytical Science & Technology
2010 Volume.23 No. 2 p.216 ~ p.223
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A study on surface modification of Ag powder for developing latent fingerprints
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Kim Man-Ki
Choi Mi-Jung
Jeon Chung-Hyun
Park Sung-Woo
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Abstract
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In previous research, results on efficiency versus size and type of Ag particles showed similarity of detection efficiency comparing the particles of flake and spherical type with the gray particle on the market and in the case of nAg (rod, 0.9 ㎛) particle, relatively good results was given in the various evaluation methods for detection efficiency of latent fingerprint. However, oxidation was occurred when nAg particles laying on nature condition for a month and due to water absorption, detection efficiency was decreased. Therefore, with need to prevent oxidation and water absorption, more research is necessary. In this research, surface modification on nAg particles using silicon oil was conducted in various methods for complementing weakness of oxidation and water absorption. Then detection efficiency of nAg particles and surface modified nAg particles was evaluated by the number of feature points on the surface of non-porous materials (glass, plastic etc.) and degree of particle adhesion with ridges and contrast of detected fingerprint. Improvement of preventing oxidation and water absorbtion was given by surface modification using silicon oil (DC200, 0.5%) on the surface of non-porous materials.
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KEYWORD
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latent fingerprint developing, surface modification, nAg powder
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