Pineapple Peel-Derived Carbon Dots: Applications as Sensor, Molecular Keypad Lock, and Memory Device

Abstract

Herein, the fluorescent carbon dots (CDs) with blue emission were prepared by hydrothermal treatment using pineapple peel as a source of carbon. The as-prepared CDs exhibited turn-Off fluorescence behavior toward Hg2+ and subsequent turn-On behavior for l-cysteine along with enhanced biocompatibility and negligible cytotoxicity for cell imaging. The practical applicability of carbon dots was used for the quantification of Hg2+ in water. On the basis of the spectral characteristic changes, we have designed individual elementary logic operations such as NOT and IMP gates, by utilizing CD as probe and Hg2+ and l-Cys as chemical inputs. We have also demonstrated the utility of this system in electronic security devices and as memory element, with the idea of the switching.

Biomolecule-derived quantum dots for sustainable optoelectronics

“…1,[31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50] Plant extracts have been demonstrated to be exceptional sources for the green fabrication of biodots, especially C-QDs and G-QDs, since they are rich carbon-containing species. 1,[31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50] Plant extract-derived QDs have shown tremendous physical features including high photoluminescence quantum yield (QY), photostability, excellent water solubility and lower cytotoxicity compared to ordinary dye and metal-based QDs, and thus demonstrated application potential in bioimaging, biosensing, photocatalysis and optoelectronics. 1,2,[31][32][33]…”

“…The added advantages of scalability, biocompatibility and costeffectiveness of biomolecule-derived QDs in addition to their tunable and superior optical features make them alternative and smart choices compared to conventional semiconductor QDs for applications ranging from biodiagnostics to optoelectronics. Accordingly, different biomolecules such as plant extracts including fruits, seeds, peels, leaves, owers, roots and vegetables, [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50] sugars including monosaccharides and polysaccharides, [51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69] different amino acids and proteins, [70][71][72][73][74][75][76]…”

Nitrogen-Doped Graphene Oxide Dots-Based “Turn-OFF” H2O2, Au(III), and “Turn-OFF–ON” Hg(II) Sensors as Logic Gates and Molecular Keypad Locks

“…Among the metal ions, Hg 2+ is one of the most dangerous inorganic pollutants for the environment 27−32 because of its persistence, accumulation, and high toxicity, that is, its exposure has been reported to cause several diseases (neurological, reproductive, and digestive) and even mortality. 33−37 Adverse effects of Hg 2+ ions call for an urgent need to develop a fast and convenient detection technique.…”

“…Yan et al 30 and Zhang et al 31 also reported the fluorescence quenching and the restoration of the signal through cysteine because of the binding preference for Hg 2+ . Recently, 32 pineapple peel-derived CDs have been tested for reversibility of the fluorescence signal from the CD nanoprobe with alternate addition of Hg 2+ and l -cystine ( l -Cys) and additionally demonstrated for their possible utility in electronic security devices and memory element. Although, using nitrogen-doped carbon nanodots derived from various carbon sources reported the “turn-off–on” Hg 2+ sensor using a photoluminescence (PL) recovering agent such as cyanide/hydrogen sulfide ions and cysteine, simultaneous implementation of low cost and sustainable efficient recovery from renewable/green inexpensive methods is still challenging.…”

Thiadiazole-based turn-on fluorescent chemosensor for AcO− and its application in environmental systems and in bioimaging

“…Among the different anions, acetate anion (AcO − ) plays an enormous role in our life, such as human metabolic process, protein synthesis [7][8][9][10][11]. For example, the abnormal rise of AcO − in the body could be the exogenous cause of urinary calculi [7,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. And AcO − can also interact with Ca 2+ to form calcium acetate, which is one of the constituents of urinary calculi [7].…”