การพัฒนาการหาลายนิ้วมือแฝงบนพื้นผิวที่เป็นโลหะโดยวิธีเคมีไฟฟ้า

Abstract

The development of the facile and rapid method for visualizing latent fingerprint (LFP) on metallic substrates based on the electrodeposition method was investigated by using a mixture of silver ions and copper ions in the deep eutectic solvent. A metal substrate is connected to the anode (positive, (+)). The cotton is connected to the cathode (negative, (-)) and dipped in a mixture of silver ions and copper ions. Then, the cotton was placed onto metal for visualization of the latent fingerprint. The latent fingerprint was obtained under the optimal conditions of electrochemical depositing potential (5.0 V), depositing current (1.5 A), depositing time (30 s), and the ratio of solution (0.05M AgNO3 + 0.05M CuSO4 in deep eutectic solvent). The latent fingerprint has appeared clearly at least 12 identical points. The method provided good repeatability. The proposed method could be applied to visualizing latent fingerprints in the forensic science field.