Electrochemical detection of silver ions by using sulfur quantum dots modified gold electrode

Luminescent Sulfur Quantum Dots: Synthesis, Properties and Potential Applications

“…[21] In the past two years, impressive progress has been made in the synthesis of luminescent SQDs from elemental sulfur, including increasing PLQY (from 3.8 % to about 50 %), shortening reaction time (from 125 h to 4 h) and increasing reaction yield (from 0.87 % to 5.08 %). [23][24][25][26][27][28][29][30][31][32] However, considering the practical applications of SQDs, there are still some important issues that need to be addressed. Firstly, the PLQY of SQDs is still much lower than commercially available QDs, such as CdTe QDs and CdSe QDs (generally higher than 50 % and even exceeding 90 %).…”

“…[33] Secondly, the emission color of SQDs is limited in the short wavelength region (e.g, blue and green emission), it is still very challenging to synthesize SQDs with red or near infrared emission. [23][24][25][26][27][28][29][30][31][32][33] In addition, overcoming the disadvantage of low reaction yield and achieving high conversion efficiency from elemental sulfur to SQDs for large-scale synthesis of SQDs is a challenge and of great importance.…”

“…Fu et al designed an electrochemical sensor for direct detection of Ag + by using SQDs as surface modifier to decorate gold electrode (Figure 9c). [28] Due to the strong bonding interaction between Au and S, the SQDs could be stably anchored on the surface of gold electrode. The electrochemical sensor showed a positive signal when Ag + was added.…”

“…[25] (c) Schematic diagram of the preparation of a DNAfree Ag + electrochemical sensor. [28] Panels (a) and (b) reprinted from Ref. [25], copyright 2020, with permission from Elsevier.…”

“…Although the research on SQDs is still in its infancy, SQDs have shown potential applications in the fields of sensing, cell imaging, photocatalysis, and so on. [25][26][27][28] The aim of this minireview is to provide a pathway for comprehensive understanding of the research status of SQDs. Firstly, various synthetic methods were introduced and compared in terms of the reaction time, reaction yield, and PLQY of SQDs.…”