Abstract
Motivated by the urgent demand for the detection of latent fingerprints using fluorescence-basednanotechnology, this work was devoted to developing a simple synthetic approach to obtainpositively charged CdTe QDs with enhanced fluorescence and affinity for the improvement oflatent fingerprint detection. Through this synthetic method, the positively charged CdTe–COONH3NH3 + QDs were successfully achieved by using hydrazine hydrate as both the surface stabilizer andpH 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 − andCdTe–COONH3NH3 + QDs for detection of latent fingerprints present on a large variety ofsmooth objects was systematically and comparatively studied. Theresults indicate that the detection of latent fingerprints by using CdTe–COONH3NH3 + QDs as fluorescent labeling marks was greatly enhanced, and more characteristicfinger ridge details were detected and identified due to their enhanced affinitywith 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 inlatent fingerprint detection.
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