“…S9 , Zn2p 1/2 and Zn2p 3/2 peaks are also evident. These peaks correspond to the characteristic peaks of ZnO, which shows a successfully incorporated Zn layer on the near surface [ [86] , [87] , [88] ]. Fig.…”
“…S9 , Zn2p 1/2 and Zn2p 3/2 peaks are also evident. These peaks correspond to the characteristic peaks of ZnO, which shows a successfully incorporated Zn layer on the near surface [ [86] , [87] , [88] ]. Fig.…”
“…ZnO (size 1–3 μm) has been shown to be a suitable material for developing fresh and old fingerprints on nonporous substrates. Limitations of ZnO are found when applied to porous surfaces, where fingerprint development is poor . Al 2 O 3 (size 30–60 nm) has been reported as an ecofriendly and stable alternative to other metal oxides.…”
Section: Emerging Applications Of Ucnpsmentioning
confidence: 99%
“…Limitations of ZnO are found when applied to porous surfaces, where fingerprint development is poor. 215 Al 2 O 3 (size 30−60 nm) has been reported as an ecofriendly and stable alternative to other metal oxides. It has also been noted to be effective at developing prints from moist surfaces, but this strategy is expensive and can be very time-consuming.…”
Lanthanide-doped upconversion nanoparticles (UCNPs) possess the remarkable ability to convert multiple near-infrared (NIR) photons into higher energy ultraviolet−visible (UV−vis) photons, making them a prime candidate for several advanced applications within the realm of nanotechnology. Compared to traditional organic fluorophores and quantum dots (QDs), UCNPs possess narrower emission bands (fwhm of 10−50 nm), large anti-Stokes shifts, low toxicity, high chemical stability, and resistance to photobleaching and blinking. In addition, unlike UV−vis excitation, NIR excitation is nondestructive at lower power intensities and has high tissue penetration depths (up to 2 mm) with low autofluorescence and scattering. Together, these properties make UCNPs exceedingly favored for advanced bioanalytical and theranostic applications, where these systems have been well-explored. UCNPs are also well-suited for bioimaging, optically modulating chemistries, forensic science, and other state-of-the-art research applications. In this review, an up-to-date account of emerging applications in UCNP research, beyond bioanalytical and theranostics, are presented including optogenetics, super-resolution imaging, encoded barcodes, fingerprinting, NIR vision, UCNP-assisted photochemical manipulations, optical tweezers, 3D printing, lasing, NIR-II imaging, UCNP-molecule nanohybrids, and UCNP-based persistent luminescent nanocrystals.
“…[16][17][18] Nanotechnology also plays a significant role in forensic science and has remarkably proven successful in developing latent fingerprints. [19,20] Nanoparticles of gold, silver, silicon oxide, zinc oxide, and several others have been used for the same. [21,22] Various powders are used for the development of latent fingerprints like titanium dioxide, manganese dioxide, and ferric oxide, neem nano biochar.…”
Since waste materials are used to identify, individualize, and evaluate evidence like fingerprints, palmprints, footprints, etc. that are found at a crime scene, they have a substantial impact on the field of forensic science. Many waste powders have recently been employed in fingerprint recognition. Nanosheets made up of eggshells have been put forward as an application in friction ridge development. Eggshell is a biochemical substance made up of chemical compounds like calcium carbonate, which is considered as a waste product. For the formation of an eggshell nanosheet (ESN), shells are dried and crushed into a fine powder and to get this powder in the form of a nanosheet, the Ball milling technique is used. The synthesis of pure ESN is confirmed by Scanning Electron Microscopy (SEM) and X‐ray diffraction (XRD) techniques. The size of nanosheets ranged from 30 to 90 nm as shown in SEM images. Developed powder is then used for the application of fingerprint development and it provides excellent results on all porous, non‐porous, and semi‐porous surfaces. Thus, this newly synthesized ESN powder can be used as a significant powder method in latent fingerprint technology.
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