Citation: Zhang Yang, Yu Xi, Zhang Xueji, Zhang Meiqin. Visualization of Latent Fingermarks by Electrochemical Co-deposition of ZnO-CuO Composite Films[J]. Chemistry, ;2016, 79(8): 739-743. shu

Visualization of Latent Fingermarks by Electrochemical Co-deposition of ZnO-CuO Composite Films

1.
Research Center for Bioengineering and Sensing Technology, University of Science and Technology Beijing, Beijing 100083

Corresponding author: Zhang Meiqin,
Received Date: 21 March 2015
Available Online: 6 April 2015
Fund Project:

A novel method for developing latent fingermarks (LFMs) on various conductive substrates (stainless steel plate, aluminum sheet, zinc sheet, copper sheet, 1 Yuan coin and 5 Jiao coin) through the electrochemical co-deposition of zinc oxide-copper oxide (ZnO-CuO) composite films has been developed here. The principle of visualizing LFMs is that the electrochemical co-deposition process selectively occurs on the valley regions and bare conductive surfaces owing to electrochemical inert property of the residues left at the ridges areas, so a color difference between the ridge and valley areas is generated resulting in a high visual contrast of the LFMs. The FE-SEM images and elemental analysis results confirmed that the ZnO-CuO composite films were electrochemically deposited on the valley regions of the LFMs rather than the ridge regions. Moreover, the visualization images of the LFMs originated from the deposition of ZnO-CuO composite films could provide the clear second level details and partial third level details of the LFMs. This method is simple, high efficient and widely applicable in the visualization of the LFMs and would be a promising tool in the practical application.
- Latent fingermarks visualization,
- Zinc oxide-copper oxide composite films,
- Electrochemical deposition,
- Conductive substrates
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沈阳化工大学材料科学与工程学院沈阳 110142