Emission quench of water-soluble ZnS–AgInS2 solid solution nanocrystals and its application to chemosensors

Abstract

Redox-dependent emission quenching of low toxic ZnS-AgInS(2) semiconductor nanocrystals was studied and the obtained behavior was found to be applicable to fabrication of fluorescent biosensors in combination with redox enzymes.

ZnS nanostructures: From synthesis to applications

“…76c demonstrates PL recovery behavior when glucose of different concentrations, ranging from 5 to 20 lM, was added to the solution. The emission intensity increases with glucose concentration, indicating that this system enables quantitative detection of glucose [452].…”

“…which are normally used in the conventional methods. By controlling the PL quenching behaviors, Uematsu and co-workers developed a highly photoluminescent ZnS-AgInS 2 solid solution (ZAIS) NCs for sensing glucose [452]. They fabricated a glucose-sensing system by combining the redox-dependent quenching of MPA-ZAIS with a redox enzyme, as illustrated in Fig.…”

Visualization of Electrochemical Reactions by Redox-dependent Quenching of Photoluminescence from ZnS-AgInS2 Solid Solution Semiconductor Nanoparticles

“…The magnitudes of quenching evaluated as I 0 /I ¹ 1 were 90 times different between its redox states, where I 0 and I are PL intensity in the absence and presence of quenchers, respectively. Another candidate is monovalent MP + used in our previous investigation on glucose sensing, 14 because MP + also loses the quenching ability by the reduction to neutral MPH. Figure 3(a) shows the time course PL intensity variation of MPA-ZAIS NPs solution (1 µM in terms of particle) in the presence of TMPDA (30 µM) when the potential of a Pt mesh electrode illustrated in Fig.…”

“…11 On the other hand, PL quenching by a photoinduced electron transfer to redox species is known as another mechanism that has higher sensitivity as to detect the adsorption of a single molecule on one NP. [12][13][14][15][16][17] The rate of electron transfer is very amenable to the changes in distance around 1 nm that is shorter than the distance needed for the FRET. We demonstrated that the polarity of both NPs and quenchers in aqueous solution profoundly affects the efficiency of the electron transfer by virtue of variations in the electrostatic force between the two species.…”

“…12,13 It was also found that the reduction of a cationic quenchers resulted in the significant loss of its quenching ability, because the neutralization upon reduction eliminates the electrostatic interaction with anionic NPs. 14 A glucose sensing was demonstrated by the charge variation of methyl phenazium cation upon its redox reaction in combination with an enzymatic reaction by glucose dehydrogenase.…”