State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou, Jiangsu 215123, P. R. China.
Institute of Forensic Science, Ministry of Public Security , Beijing 100038, P. R. China.
ACS Appl Mater Interfaces. 2017 Feb 8;9(5):4908-4915. doi: 10.1021/acsami.6b15951. Epub 2017 Jan 24.
Poly(p-phenylenevinylene) (PPV) nanoparticles in aqueous colloidal solution have been prepared via a modified Wessling method, with the addition of surfactant. The fluorescent colloidal solution was used as the developing solution to develop the fingerprints on different substrates. The developing process was accomplished simply by immersing the substrates into developing solution and then taking out, followed by rinsing with deionized water. The initial study about the fingerprints on the adhesive tapes showed that the developing solution is very effective in fluorescence development on both fresh and aged visible fingerprints; and such an effect was negligibly affected by treating the fingerprints with water or other organic solvents, whether before developing or after. Further study on latent fingerprints (LFPs) demonstrated that PPV nanoparticles in colloidal solution have high sensitivity in developing fingerprints to give very clearly fluorescent patterns. At least 6 months of storage of the colloidal solution did not reduce the developing effect; and each developing solution (3.6 mg/mL, 5.0 mL) can be used to develop at least 30 fingerprints without sacrificing the legibility of the pattern. The preliminary mechanism investigation suggested that selectivity achieved toward the ridge of the fingerprint is very likely due to the affinity between PPV molecules and oily secretions of the fingerprints. Digital magnification of the developed fingerprints provided more details about the fingerprint.
通过改良的 Wessling 方法，在添加表面活性剂的情况下，制备了在水性胶体溶液中的聚对苯乙炔（PPV）纳米粒子。荧光胶体溶液被用作显影剂，在不同基底上显影指纹。显影过程非常简单，只需将基底浸入显影溶液中，然后取出，再用去离子水冲洗。初步研究表明，在胶带上的指纹显示，显影溶液在新鲜和老化的可见指纹上的荧光显影非常有效；并且这种效果在显影前后用水分或其他有机溶剂处理指纹时可以忽略不计。对潜伏指纹（LFPs）的进一步研究表明，胶体溶液中的 PPV 纳米粒子在显影指纹时具有很高的灵敏度，能够给出非常清晰的荧光图案。至少 6 个月的胶体溶液储存不会降低显影效果；并且每 3.6 毫克/毫升的 5.0 毫升显影溶液可用于显影至少 30 个指纹，而不会牺牲图案的清晰度。初步的机制研究表明，对指纹脊的选择性很可能是由于 PPV 分子与指纹油性分泌物之间的亲和力。对显影指纹的数字放大提供了更多有关指纹的细节。
