Enhancing the electrochemiluminescence of tris(2,2'-bipyridyl)ruthenium(II) by ionic surfactants.
The dependence of the electrochemiluminescence of Ru(bpy)3(2+) (bpy = 2,2'-bipyridine) with tri-n-propylamine as co-reactant on the anionic surfactant SDS (sodium dodecyl sulfate) and the cationic surfactants CTAX (CTA = cetyltrimethylammonium cation, X = bromide, chloride and hydrogensulfate) was studied. Both SDS and CTAX, at low surfactant concentrations below the critical micelle concentrations, enhance the electrochemiluminescence at a platinum working electrode. A further enhancement of the light emission intensity by bromide ions was observed when CTAB (B = bromide) was used-an overall 30-fold increase in electrochemiluminescence efficiency was obtained at a CTAB concentration of 0.08 mM. Voltammetric data support adsorption of surfactant molecules on the electrode surface as the cause of the enhancement of electrochemiluminescence by ionic surfactants.
Xu
Guobao
G
Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, PR China.
Pang
Hei-Leung
HL
Xu
Bo
B
Dong
Shaojun
S
Wong
Kwok-Yin
KY
D000818:Animals; D000077286:Cetrimonium; D002593:Cetrimonium Compounds; D015342:DNA Probes; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods; D004566:Electrodes; D007118:Immunoassay; D007477:Ions; D008163:Luminescent Measurements; D009942:Organometallic Compounds; D010984:Platinum; D013501:Surface-Active Agents
D002593:Cetrimonium Compounds; D015342:DNA Probes; D007477:Ions; D009942:Organometallic Compounds; D013501:Surface-Active Agents; C415768:tris(2,2'-bipyridyl)ruthenium(II); D010984:Platinum; D000077286:Cetrimonium