We report how electrochemiluminescence (ECL) of rubrene can be utilized for enhancing the visualization of latent fingerprints in two different modes. The enhancement arises from the spatially selective ECL generation either from the substrate surface uncovered by the fingerprint or the fingerprint itself, designated negative or positive imaging mode, respectively. The negative mode is performed directly in an electrolyte solution containing rubrene and co-reactant. Given that organic residues in the fingerprint deposit make the underlying surface electrochemically inert or less active, ECL reaction occurs only on the surface untouched by the fingertip, generating a negative impression with a dark ridge pattern against the illuminated background. The positive imaging mode is based on the preferential adsorption of rubrene aggregates to the ridge materials via physical attraction; then the fingerprint can glow via ECL reaction in a solution containing co-reactant under an appropriate applied potential.
Jingling Wu,Peiyao Ran,Shu Zhu,Fangjing Mo,Cun Wang,Yingzi Fu
We present a highly sensitive platinum nanoparticles (PtNPs), rhombus-shaped rubrene microsheets (RubRMs) and dissolved oxygen (O 2 ) system for the monitoring of l -cysteine by the quenched electrochemiluminescence (ECL) signals. Firstly, RubRMs has been prepared through reprecipitation method, then the metal organic composites of PtNPs-RubRMs was synthesized by a simple in situ reduction of PtNPs on RubRMs surface. The composites combined the high ECL characteristic of RubRMs, the wonderful catalytic efficiency and good electron transfer ability of PtNPs. With the synergistic effect between RubRMs and PtNPs, the proposed ECL sensors exhibited excellent responses for l -cysteine. Under the optimum conditions, the linear range was from 1.0 × 10 −9 mol L -1 to 5.0 × 10 -4 mol L -1 with a detection limit of 3.3 × 10 -10 mol L -1 (S/N = 3). And the results shows high sensitivity, excellent stability, and low background signal. It is simple to prepare and operate for the practical application.
危险品化学品经营许可证（带存储）