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                            Library & Multimedia
 Luminescence decay dynamics and trace biomaterials detection potential of surface-functionalized nanoparticles
NCJ Number
              305382
Journal

*Journal of Physical Chemistry C* Volume: 112 Issue: 46 Dated: 2008 Pages: 17931-17939
Author(s)
          Kwan H. Cheng;
                        Jacob Aijmo†;
                        Lun Ma;
                        Mingzhen Yao;
                        Xing Zhang;
                        John Como;
                        Louisa J.Hope-Weeks;
                        Juyang Huang;
                        Wei Chen
Date Published

2008
Length
              9 pages
Annotation
              This article presents research in the luminescence decay and trace biomaterials detection potential of two surface-functionalized nanoparticles.
Abstract
              The authors have studied the luminescence decay and trace biomaterials detection potential of two surface-functionalized nanoparticles, poly(ethylene glycol) bis(carboxymethyl) ether-coated LaF3:Ce,Tb (∼20 nm) and thioglycolic acid-coated ZnS/Mn (∼5 nm). Upon UV excitation, these nanoparticles emitted fluorescence peaking at 540 and 597 nm, respectively, in solution. Fluorescence imaging revealed that these nanoparticles targeted the trace biomaterials from fingerprints that were deposited on various nonporous solid substrates. Highly ordered, microscopic sweat pores within the friction ridges of the fingerprints were labeled with good spatial resolutions by the nanoparticles on aluminum and polymethylpentene substrates, but not on glass or quartz. In solution, these nanoparticles exhibited multicomponent fluorescence decays of resolved lifetimes ranging from nano- to microseconds and of average lifetimes of ∼24 and 130 μs for the coated LaF3:Ce,Tb and ZnS:Mn, respectively. The long microsecond-decay components are associated with the emitters at or near the nanocrystal core surface that are sensitive to the size, surface-functionalization, and solvent exposure of the nanoparticles. When the nanoparticles were bound to the surface of a solid substrate and in the dried state, a decrease in the microsecond decay lifetimes was observed, indicative of a change in the coating environment of the nanocrystal surface upon binding and solvent removal. The average decay lifetimes for the surface bound ZnS:Mn in the dried state were ∼60, 30, and 11 μs on quartz, aluminum, and polymethylpentene, respectively. These values were still 2 orders of magnitude longer than the typical fluorescence decay background of most substrates (e.g., ∼0.36 μs for polymethylpentene) in trace forensic evidence detections. The authors conclude that coated ZnS:Mn nanoparticles hold great promise as a nontoxic labeling agent for ultrasensitive, time-gated, trace evidence detections in nanoforensic applications. (Publisher abstract provided)
      
  
          Additional Details
Grant Number(s)
        2003-IJ-CX-K016


  
  
        
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  Award
        Texas Tech: Institute of Forensic Sciences Crime Laboratory Improvement Program; Forensic Technical Training Initiative
    
  
  
Date Published: January 1, 2008
    
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                Forensic sciences
        Friction ridges
        Evidence analysis and processing
        Trace evidence



  
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