Green synthesis of carbon quantum dots from sumac: characterization and investigation with cyclic voltammetry technique

Abstract

Carbon dots, due to their minimal size, non-toxicity, simple, cheap and easy synthesis; Among the studies on nanostructured materials that have attracted attention in recent years; has become a popular study topic for researchers. In this study, for the first time, Sumac was used as a source of carbon, and carbon dots were obtained by using the hydrothermal synthesis method in a one-pot reaction at 175 ° C for 8 hours without using any chemical reagents. The characterizations of the obtained carbon dots were illuminated by various analytical instruments (High-Resolution Transmission Electron Microscope (HR-TEM), X-ray Diffractometer (XRD), Raman, Photoluminescence, Infrared, and Uv-vis spectrometer). According to the TEM results, the average diameter of carbon dots was found as 10.48 nm. The maximum emission peak of the carbon dots was monitored at 428 nm when excited at 350 nm. In the next step, the electrochemical properties of the carbon dots were examined by cyclic voltammetry technique. According to cyclic voltammetry results, the substance transport on the electrode surface by diffusion controlled.

Effect of ZnO Nanomaterial and Red and Green Cabbage Dyes on the Performance of Dye-Sensitised Solar Cells

“…The RC extract outperformed the GC extract (see Figure 8d). The CV curves have similar shapes for both extracts, implying that both the extracts possessed reversibility as well as faster redox reactions, which is consistent with the results in the literature [64][65][66]. These observations describe the near-surface layer storage charge pseudo-capacitance.…”

“…This is attributed to the strong bonds between the dye and ZnO molecules through which electrons can be transported from the excited dye molecules to the nano ZnO film, which is opposite to the results reported in [16]. Also, the lower trends of the GC-based cells are due to the reduced stability of chlorophyll at higher temperatures, in agreement with previously reported results [66].…”

Carbon Dots from Turnip Juice: Synthesis, Characterization and Investigation of pH-Dependent Optical Properties

“…The excitation wavelength were ranging from 336 nm to 436 nm, and the redshift in the emission intensity were found with increasing excitation wavelength and after emission peak stats to decrease after certain point that is refer to common feature of the formation of CDs [26]. The existences of different surface active states on CD might the reason of excitation dependent PL properties of the synthesized CDs [23,27]. It is important to examine the relationship of fluorescence behaviour of carbon dots with pH change.…”

One-Pot Synthesis of Carbon Quantum Dots and Their Application as a Fluorescent Inks

“…CDs are synthesized from many different chemicals and organic sources. For example, urea [17], ammonium citrate [18], glycerol [19], citric acid [20], phytic acid [21], graphite [22], boronic acid [23], ethylenediaminetetraacetate [24] , zinc oxide [25], ocimum sanctum [26], onion waste [27], sweet potato [28], aloe vera [29], mandarin juice [30], ginkgo leaves [2], tangerine juice [31], sumac [32], prunus mume [33], starch [34], milk [35], coffee bean shell [36], black tea [37], eleusine coracana [38], plectranthus amboinicus [39], borassus flabellifer [40] and rosemary leaves [41] are some example of precursors.…”