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    • Keywords


      Fluorescent; sensing; quenching; photo-induced electron transfer; selectivity.

    • Abstract


      A fluorescent probe termed as quantum dot complex (QDC) was synthesized by surface functionalizing Pd(II) complex to ZnS Qdot surface mediated through dangling S$^{2-}$ ions. The optical and morphological properties of QDC have been studied extensively through various characterization techniques. Steady state fluorescence study revealed the ultrasensitive capacity of QDC to selectively detect pyrophosphate (PPi) anion within few seconds of analyte addition. The limit of detection was found to be 39.4 ${\mu}$M. The sensing phenomenon is based on a unique partial quenching behaviour exhibited by QDC emission on analyte addition. The partial quenching effect is governed by the combined effect of photo-induced electron transfer and reabsorption in the complex system comprising of Qdot, Pd(II) complex and PPi anions. The selectivity results were compared with a statistical analysis by performing paired t-test. Significant difference in quenching efficiency of PPi with other ions, on the emission intensity of QDC was observed (95% confidence interval). Thus the sensor can be said to be demonstrating selectivity.

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    • Author Affiliations



      1. Department of Chemistry, Indian Institute of Guwahati, Guwahati 781039, India
      2. Advanced Materials Group, Materials Sciences and Technology Division, CSIR-NEIST, Jorhat 785006, India
      3. Department of Management, Assam Womens’ University, Jorhat 785004, India
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    • Supplementary Material

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