Electrochromic response and electrochemiluminescence of CdS nanocrystals thin film in aqueous solution

Electrochemiluminescence properties of Tb(III) nicotinic acid complex and its analytical application

“…However, the ECL intensity of Tb 2 (C 6 NO 2 H 4 ) 6 (H 2 O) 4 /K 2 S 2 O 8 mixture system remained nearly unchanged after the solution was deoxygenated with pure nitrogen for 20 min. Obviously, these results suggested that the reduction of Tb 2 (C 6 NO 2 H 4 ) 6 (H 2 O) 4 played an important role in the ECL process and the light-emitting species in the Tb 2 (C 6 NO 2 H 4 ) 6 (H 2 O) 4 /K 2 S 2 O 8 mixture system was different from that in potassium peroxodisulfate aqueous solution. …”

“…The reduction peak potentials were about À 0.92 V and À1.50 V, respectively. Compared cure d with curves b and c, c 1 was ascribe to the reduction of S 2 O 8 2À and c 2 was attributed to the reduction of Tb 2 (C 6 NO 2 H 4 ) 6 (H 2 O) 4 . In addition, the dependences of the reduction peak currents of Tb 2 (C 6 NO 2 H 4 ) 6 (H 2 O) 4 /K 2 S 2 O 8 mixture system in 0.05 M HAc-NaAc buffer (pH ¼5.5) on the scan rates were investigated to identify the type of current over the range of scan rates from 5 to 300 mV/s.…”

“…When the negative scan potential reached about À 0.92 V, S 2 , and then a strong ECL was produced when the Tb 2 (C 6 NO 2 H 4 ) 6 (H 2 O) 4 n was back to Tb 2 (C 6 NO 2 H 4 ) 6 (H 2 O) 4 . The possible equation of the ECL mechanism was proposed as follows: …”

“…The luminescent materials play an important role in the ECL. Various materials such as, organometallic complexes [2], luminol [3] and semiconductor nanocrystals [4,5] which can generate ECL emission have attracted considerable interest [6][7][8]. Among them, trivalent lanthanide complexes have received wide attention as luminescent materials due to their high photoluminescence efficiencies, large Stokes' shifts, long excited-state lifetimes and narrow emission spectra [9,10].…”

Electrochemiluminescence Sensor for Phosphate Ions Based on Europium(III)‐Modulated CdSe Quantum Dots

“…Especially, QDs-based ECL bioassay has become one of the most exciting forefront fields in analytical chemistry.The ECL of Si QDs was first observed by Bard et al in 2002 [12]. Since then various semiconductor quantum dots such as CdS [13], CdSe [14], CdTe [15] and PbSe [16] have been widely used as ECL luminophores, based on which numerous chemosensors and biosensors have been fabricated for the determination of H 2 O 2 , Pb 2 + , Cu 2 + , tripropylamine, ascorbic acid, dopamine, and DNA [17]. Among the miscellaneous quantum dots, CdSe QDs are of considerable interest in biosensors and bioassays owing to their unique size-dependent optical and electronic properties.…”