Center of Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals, Dhahran, 31262, Saudi Arabia.
Physics Department, King Fahd University of Petroleum and Minerals, Dhahran, 31262, Saudi Arabia.
Methods Appl Fluoresc. 2021 Feb 22;9(2):025002. doi: 10.1088/2050-6120/abdbc0.
A series of green emitting GdO:Tb (Tb: 0%-10% mol) nanoparticles (NP) were synthesized using the hydrothermal method, then characterized and evaluated for latent fingerprint visualization. X-ray diffraction study (XRD) revealed a cubic structure of the nanoparticles and the total incorporation of the terbium in the GdO matrix. Field Emission-Scanning Electron Microscopy (FESEM), Energy Dispersive x-ray Spectrometry (EDX) and Transmission Electron Microscopy (TEM) were used to study the morphology and the elementary composition of the NP. Photoluminescence (PL) studies showed strong green emission around 540 nm due to the transition D → F. The luminescence color of the synthesized NP was characterized by the CIE 1931 chromaticity diagram. The potential use of the NP powders for the visualization of latent fingerprint under UV irradiation was assessed on various substrates. The latent fingerprint images revealed by the GdO:Tb NP powders are clear enough to extract and analyze reliable fingerprint features. The fingerprint quality was evaluated using three fingerprint quality assessment metrics and by extracting and measuring the visibility of the minutiae. The experimental results show very good quality images of the latent fingerprint acquired using the GdO:Tb NP and yield good minutiae extraction.
一系列绿色发光的 GdO:Tb（Tb：0%-10%摩尔）纳米粒子（NP）是通过水热法合成的，然后对其进行了表征，并评估了其用于潜在指纹可视化的性能。X 射线衍射研究（XRD）表明纳米粒子具有立方结构，并且 terbium 完全掺入了 GdO 基质中。场发射扫描电子显微镜（FESEM）、能谱（EDX）和透射电子显微镜（TEM）用于研究 NP 的形态和元素组成。光致发光（PL）研究表明，由于 D→F 跃迁，在 540nm 左右有强烈的绿色发射。合成 NP 的发光颜色通过 CIE 1931 色度图进行了表征。NP 粉末在紫外光照射下对各种基底进行潜在指纹可视化的潜在用途进行了评估。通过 GdO:Tb NP 粉末揭示的潜在指纹图像足够清晰，可以提取和分析可靠的指纹特征。使用三个指纹质量评估指标并提取和测量细节点的可视性来评估指纹质量。实验结果表明，使用 GdO:Tb NP 获得的潜在指纹图像质量非常好，并且可以很好地提取细节点。
