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A simple and ubiquitous device for picric acid detection in latent fingerprints using carbon dots.
Analyst ( IF 3.6 ) Pub Date : 2020-05-07 , DOI: 10.1039/d0an00750a Arunkumar Kathiravan 1 , Annasamy Gowri , Venkatesan Srinivasan , Trevor A Smith , Muthupandian Ashokkumar , Mariadoss Asha Jhonsi
Analyst ( IF 3.6 ) Pub Date : 2020-05-07 , DOI: 10.1039/d0an00750a Arunkumar Kathiravan 1 , Annasamy Gowri , Venkatesan Srinivasan , Trevor A Smith , Muthupandian Ashokkumar , Mariadoss Asha Jhonsi
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This work addresses the synthetic optimization of carbon dots (CDs) and their application in sensing picric acid from latent fingerprints by exploiting a smartphone-based RGB tool. The optimization of the synthesis of CDs is investigated towards achieving shorter reaction time, better product yield and fluorescence quantum efficiency. Precursors such as citric acid and thiourea were chosen for the synthesis of CDs. Among the various synthetic methodologies, it is found that the pyrolysis method offers ∼50% product yield within 15 min. The morphology and optical properties of the prepared CDs are characterized using the typical microscopic and spectroscopic techniques, respectively. The synthesized CDs exhibit quasi-spherical shape with an average particle size of 1.7 nm. The excitation dependent emissive properties of CDs are investigated by time resolved fluorescence spectroscopy. Furthermore, the excellent fluorescence properties (ϕ = 11%) of CDs are explored as a fluorescent fingerprint powder for the identification of latent fingerprints on various substrates. In addition, the presence of picric acid in latent fingerprints was detected. Furthermore, this study is extended to perform real time detection of fingerprints and harmful contaminants in fingerprints by utilizing a smartphone-based RGB color analysis tool. Based on these investigations, the prepared CDs could be a prospective fluorescent material in the field of forensics.
中文翻译：
一种使用碳点检测潜伏指纹中苦味酸的简单且普遍存在的设备。
这项工作通过利用基于智能手机的RGB工具解决了碳点（CD）的合成优化及其在从潜在指纹中感测苦味酸中的应用。为了实现更短的反应时间，更好的产物收率和荧光量子效率，对CD合成的优化进行了研究。选择诸如柠檬酸和硫脲的前体来合成CD。在各种合成方法中，发现热解方法可在15分钟内提供约50％的产物收率。所制备的CD的形态和光学性质分别使用典型的显微镜和光谱技术表征。合成的CD表现为准球形，平均粒径为1.7 nm。通过时间分辨荧光光谱法研究了CD的依赖于激发的发射性质。此外，出色的荧光性能（ϕ = 11％的CD被用作荧光指纹粉，用于鉴定各种底物上的潜在指纹。另外，检测到潜伏指纹中存在苦味酸。此外，这项研究已扩展到可以利用基于智能手机的RGB颜色分析工具对指纹和指纹中的有害污染物进行实时检测。基于这些调查，准备的CD可能是法医领域的一种前瞻性荧光材料。
更新日期：2020-06-29
中文翻译：
一种使用碳点检测潜伏指纹中苦味酸的简单且普遍存在的设备。
这项工作通过利用基于智能手机的RGB工具解决了碳点（CD）的合成优化及其在从潜在指纹中感测苦味酸中的应用。为了实现更短的反应时间，更好的产物收率和荧光量子效率，对CD合成的优化进行了研究。选择诸如柠檬酸和硫脲的前体来合成CD。在各种合成方法中，发现热解方法可在15分钟内提供约50％的产物收率。所制备的CD的形态和光学性质分别使用典型的显微镜和光谱技术表征。合成的CD表现为准球形，平均粒径为1.7 nm。通过时间分辨荧光光谱法研究了CD的依赖于激发的发射性质。此外，出色的荧光性能（ϕ = 11％的CD被用作荧光指纹粉，用于鉴定各种底物上的潜在指纹。另外，检测到潜伏指纹中存在苦味酸。此外，这项研究已扩展到可以利用基于智能手机的RGB颜色分析工具对指纹和指纹中的有害污染物进行实时检测。基于这些调查，准备的CD可能是法医领域的一种前瞻性荧光材料。
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