Electrochemiluminescence Properties Of Two Novel Organic Nanoparticals

Electrogenerated chemiluminescence（also called electrochemiluminescence, ECL）is the process in which light is emitted during the high-energy electron-transfer reactionsat working electrodes in electrochemical processes, which is superior to otherchemiluminescent (CL) methods, such as high sensitivity, low background noise, widedynamic concentration response range, and controllable procedure. ECL technique hasbeen one of the research fields that analytical chemistry workers are mostly interested in.Herein, two new organic nanoparticles named BPEA and DPAVBi were respectivelyprepared through reprecipitation method. Characterization of the nanoparticles usingdifferert techniques, such as Scanning electron microscopy (SEM), transmission electronmicroscopy(TEM), X-ray diffraction, UV-vis absorption, fluorescent spectroscopy. Moreimportantly, the electrochemical luminescence properties and their mechanismes were firstdiscussed. The results are as follows.(1) The average size of the as-obtained BPEA crystalline particle is40nm. Forelectronic absorption spectra of BPEA nanoparticle, the maximum absorption at about460nm, generate a characteristic bathochromic10nm compared with that of the dilutesolution, When excited by light of420nm, BPEA nanoparticles exhibit a characteristicgreen emission centred at522nm and an orange emission at595nm, ECL spectrameasured by filter is coincide with the photoluminescence. BPEA nanoparticles showsignificant ECL properties and its intensity is very stable, it is very sensitive to theconcentration of amine such as TPrA and Creatinine and has a wide liner range, it also inresponse to dye molecules like methylene blue. For ECL mechanism of BPEAnanoparticles, we have done a detailed speculation and discussion.(2) It is demonstrated that the average size of the DPAVBi nanoparticle is60nm. TheUV-vis spectra of DPAVBi nanoparticles with the maximum absoption peak band at394nm, lead to a blue-shift of8nm for the maximum absorption peak compared with thesolution. The as-prepared DPAVBi nanoparticles remained stable in an aqueous solutionand have a significant ECL property. Its electrochemical luminescence signal is the largest when the wavelength is553nm. In addition, ECL signals related to TPrA concentrationwere measured, it exhibited a wide linear range.In summary, this article from the perspective of looking for better ECL materials,two organic nanoparticles with the names of BPEA and DPAVBi were successfullydesigned and prepared using reprecipitation, and they show a higher stable ECL signal.Their ECL intensity has a unique induction of some certain substances such as theconcentration of co-reaction, which demonstrate a tremendous potential application in thefields such as novel opto-electronic functional materials and bio-sensor.