Fluorescence-tunable copper nanoclusters and their application in hexavalent chromium sensing

Abstract

Generally, metal nanoclusters are synthesized using only a single ligand.

Synthesis of Copper Nanocluster and Its Application in Pollutant Analysis

“…Since BSA is a very popular protein template in the synthesis of metal nanoclusters, many other BSA-Cu NCs with blue luminescence were subsequently reported [ 12 , 19 , 20 ]. Apart from proteins, thiolate ligands were also used widely to prepare Cu NCs [ 17 , 21 , 22 , 23 , 24 ]. In this category, glutathione (GSH) was a typical one [ 25 , 26 , 27 ].…”

“…The most notable advantage of this material is that the L-cysteine-capped Cu NCs could be stored for more than 3 months in powder form without perceptible changes in their optical property. Moreover, a series of bi-ligand Cu NCs were developed using both thiosalicylic acid and cysteamine as protective and reducing agents [ 21 ]. The quantum yields of the products varied from 18.9% to 34.0% with the increase in cysteamine portion.…”

Ligand functionalized copper nanoclusters for versatile applications in catalysis, sensing, bioimaging, and optoelectronics

“…Hg 2+ , 38,62,147,206,207 Al 3+ , 61,158,208 Zn 2+ , 208,209 Fe 3+ , 4,30,108,138,[210][211][212][213] Au 3+ , 214 Mn 2+ , 133 Pb + , 215 chromium(IV), 216 Cr 6+ , 217 Cu 2+ ; [218][219][220] various organic compounds; water in organic solvents; 60,221 and H 2 O 2 9,117,126,137 and H 2 S 156,222,223 in aqueous systems.…”

“…Bi-ligand stabilized Cu NCs composed of thiosalicylic acid and cysteamine at different ratios showed a PLQY of up to 34% and were used for Cr +6 detection in a linear range of 0.1-1000 mM with a LOD of 0.03 mM. 217 The PL quenching in the presence of Cr 6+ ions was related to the IFE mechanism because of a large overlap between the Cu NC excitation and Cr 6+ absorption spectrum. In a real sample examination (mineral water), a high recovery in the range of 98.3-105.0% was attained.…”

‘Turn‐off’ fluorescence strategy for determination of hexavalent chromium ions based on copper nanoclusters

“…Therefore, a method with good detection selectivity, low detection limit, and simple operation should be developed. New methods that use metal nanoclusters as fluorescence probes for detecting Cr(VI) have been recently described [ 12–18 ] (Table 1). We then compared the performance of these methods.…”