Abstract
We investigated the effect of using D2O versus H2O as solvent on the spectroscopic properties of two NIR emissive DNA-stabilized silver nanoclusters (DNA–AgNCs). The two DNA–AgNCs were chosen because they emit in the same energy range as the third overtone of the O–H stretch. Opposite effects on the ns-lived decay were observed for the two DNA–AgNCs. Surprisingly, for one DNA–AgNC, D2O shortened the ns decay time and enhanced the amount of µs-lived emission. We hypothesize that the observed effects originate from the differences in the hydrogen bonding strength and vibrational frequencies in the two diverse solvents. For the other DNA–AgNC, D2O lengthened the ns decay time and made the fluorescence quantum yield approach unity at 5 °C.
Highlights
DNA-stabilized silver nanoclusters (DNA–AgNCs) were rst introduced by Petty et al.[1] and consist of a limited number of silver atoms and cations embedded in one or more DNA strands
HPLC puri cation and the collected fraction of the DNA–Ag16NC sample can be found in the Electronic supplementary information (ESI) and Fig. S1.† Fig. 1A shows the normalized absorption and emission spectra of DNA–Ag16NCs in the DD condition and HH condition at room temperature
The emission intensity decreases by increasing the temperature, as shown in the steady-state spectra reported in Fig. S3.† timecorrelated single photon counting (TCSPC) data, e.g. in Fig. 2B, were recorded with different laser repetition rates and emission attenuations, the intensities of hsi were normalized and the background amplitudes were rescaled dividing by the corresponding hsi emission intensity maxima
Summary
DNA-stabilized silver nanoclusters (DNA–AgNCs) were rst introduced by Petty et al.[1] and consist of a limited number of silver atoms and cations embedded in one or more DNA strands. When performing time-resolved measurements with a Xe ash lamp (repetition rate 1⁄4 300 Hz) at À196 C (Fig. 3C, S7† and Table 1), ms-lived emission can be observed for both the DD and HH conditions.
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