Journal
NANOTECHNOLOGY
Volume 22, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/22/7/075705
Keywords
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Funding
- National High Technology Research and Development Program [2010AA03A407]
- Department of Science and Technology of Inner Mongolia (Public Security Foundation) [208096]
- National Natural Science Foundation of China [20961005, 20601012]
- Ministry of Education [327011]
- Overseas Returned Talent Start-up Funding for Research of the Ministry of Education of China [208138]
- Inner Mongolia University [10013-121008]
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Motivated by the urgent demand for the detection of latent fingerprints using fluorescence-based nanotechnology, this work was devoted to developing a simple synthetic approach to obtain positively charged CdTe QDs with enhanced fluorescence and affinity for the improvement of latent fingerprint detection. Through this synthetic method, the positively charged CdTe-COONH3NH3+ QDs were successfully achieved by using hydrazine hydrate as both the surface stabilizer and pH adjuster during the preparation process. In comparison to the negatively charged CdTe-COO-QDs prepared by using sodium hydroxide as the pH adjuster, the CdTe-COONH3NH3+ QDs showed enhanced fluorescence. The effectiveness of CdTe-COO- and CdTe-COONH3NH3+ QDs for detection of latent fingerprints present on a large variety of smooth objects was systematically and comparatively studied. The results indicate that the detection of latent fingerprints by using CdTe-COONH3NH3+ QDs as fluorescent labeling marks was greatly enhanced, and more characteristic finger ridge details were detected and identified due to their enhanced affinity with latent fingerprints, in comparison to the detection by using CdTe-COO-QDs as fluorescent labeling marks. The CdTe-COONH3NH3+ QDs show superior detection capability than the CdTe-COO-QDs, which greatly improves the applicability of CdTe QDs for practical application in latent fingerprint detection.
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