Isomeric Effect of Mercaptobenzoic Acids on the Preparation and Fluorescent Properties of Copper Nanoclusters
Date Issued
2015
Date
2015
Author(s)
Lin, Yi-Jyun
Abstract
An one-pot approach has been developed to synthesize copper nanoclusters (Cu NCs) aggregates from copper nitrate and mercaptobenzoic acid (MBA) at 70 °C within 30 min. Cu NCs prepared separately from the three isomers of MBA exhibit different physical and optical properties. 2-Mercaptobenzoic acid (thiosalicylic acid, TA) and 4-mercaptobenzoic acid (4-MBA) allow preparation of blue- and red-emissive Cu NCs aggregates when excited at 338 and 324 nm, with quantum yields of 13.2% and 0.5%, respectively. On the other hand, Cu NCs aggregates prepared from 3-mercaptobenzoic acid (3-MBA) have very weak red-emission properties. Upon increasing pH values from 3.0 to 11.0, the fluorescence intensity of TA-Cu NCs and 4-MBA-Cu NCs aggregates increases and decreases, respectively. Unlike TA-Cu NCs aggregates, 4-MBA-Cu NCs aggregates show strong aggregation-induced emission. The water-dispersible, stable, and highly fluorescent TA-Cu NCs aggregates allow detection of CNˉ down to 5 nM, based on analyte-induced fluorescence quenching.
Subjects
Isomeric effect
copper nanocluster
fluorescence
aggregation-induced emission
cyanide detection
Type
thesis
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