Sensitive and Selective Detection of Silver(I) Ion in Aqueous Solution Using Carbon Nanoparticles as a Cheap, Effective Fluorescent Sensing Platform

Abstract

In this Letter, we demonstrate the first use of carbon nanoparticles (CNPs) obtained from carbon soot by lighting a candle as a cheap, effective fluorescent sensing platform for Ag(+) detection with a detection limit as low as 500 pM and high selectivity. We further demonstrate its practical application to detect Ag(+) in a real sample.

Fluorescent carbon quantum dot hydrogels for direct determination of silver ions

“…A quenching effect on CQD fluorescence has been observed for CQDs synthesized from lactose and then functionalized with mercaptosuccinic acid [27] as a result of the thiolAg interaction. In the other hand, other authors [28][29][30] reported a second mechanism of Ag + detection based on an enhancement on the carbon-based nanodots fluorescence due to the reduction of Ag + to Ag 0 . Furthermore, such mechanism makes it feasible to synthesize silver nanoparticles [31][32].…”

A Label-Free Oligonucleotide Based Thioflavin-T Fluorescent Switch for Ag+ Detection with low Background Emission

“…Given the high toxicity and the ability to accumulate in the body, Ag + ions are particularly dangerous to aquatic organisms [3,4]. Thus, the detection of Ag + is of particular importance [5][6][7][8][9][10][11][12]. A few approaches for the detection of Ag + have been developed, including inductively coupled plasma-mass spectroscopy (ICP-MS) [13], atomic absorption spectroscopy [14], fluorescence spectroscopy [15], and ion-selective electrodes (ISE) [16].…”

“…The interaction between Ag + and cytosine-cytosine (C-C) mismatches has been extensively studied and numerous oligonucleotide-based fluorescent Ag + sensors have been developed [9,[18][19][20][21][22][23]. Ono et al reported the selective interaction of Ag + with C-C mismatches, and developed a fluorescent Ag + sensor for detecting aqueous Ag + ions using C-rich silver-specific oligonucleotides (SSO) doubly labeled with a fluorophore and a quencher [18].…”

“…However, this system required labeled oligonucleotide which is not costeffective and probed the presence of Ag + by fluorescence quenching which can be induced by a variety of interfering mechanisms [20]. Single-labeled fluorescent SSO-based Ag + sensors were developed using deoxyguanosine bases [8], single-walled carbon nanotubes (SWNTs) [21], graphene oxide (GO) [22], nano-C60 [7], and carbon dots [9] as a quencher. Tseng et al reported the label-free SSO-based fluorescent Ag + sensor with the use of a double-strandchelating dye SYBR Green I (SG) [19].…”

Selective and Sensitive Detection of Silver(I) Ion Based on Tetracationic Complex and TGA/GSH Co-capped Quantum Dots as an Effective Fluorescent Sensing Platform

“…For example, Li et al reported a graphene-based fluorescent DNA sensor for silver(I) ions detection. 19 A fluorescein (FAM) labeled C-rich single strand DNA (ssDNA) was applied in this study. In the absence of Ag + , graphene oxide (GO) can selectively absorb and quench the fluorescence of ssDNA by the formation of stable GO-DNA complexes.…”