Pollutant soot of diesel engine exhaust transformed to carbon dots for multicoloured imaging of E. coli and sensing cholesterol

A simple one-step hydrothermal route towards water solubilization of carbon quantum dots from soya-nuggets for imaging applications

“…7b, 47,64 The high density of surficial negative oxygenous functional groups of wsCQDs is confirmed by zeta potential (showing the high negative value of -29.8 mV), which is in accordance with our FTIR and Raman results. 65.9 wt%.…”

“…As expected oxidative treatment, 47 FTIR and Raman spectroscopic measurement were performed to recognize the presence of negative surface functionalities and highdensity surface defects (D bands of Raman) over the surface of wsCQDs respectively. 7b,47 A representative FTIR spectrum of wsCQDs has shown in Figure 1 (a).…”

“…A distinct strong absorption peak at ~295 nm was observed due to the n-π* transitions of C=O of high density surfacial-COOH on wsCQDs. 7b, 47,64,68 For detailed optical properties of wsCQDs, its photoluminescent (PL) spectra with varying excitation wavelength from 400 to 600 nm with 20 nm continuous increase have analyzed and presented in Figure 4 (b). The tunable emission property of wsCQDs shows broad and excitation wavelength dependent PL properties and maximum emission intensity was observed at 420 nm excitation wavelength.…”

Sunlight-Induced Photochemical Degradation of Methylene Blue by Water-Soluble Carbon Nanorods

“…Till now, CNRs are the least explored in comparison with other members of nanocarbon family [3,4,[6][7][8][9][10][11][12][13][14][15][16][17]. All these allotropic nanocarbons such as multiwalled CNTs [3]/ single-walled CNTs [4], fullerenes [6], carbon nanoonions [7][8][9], carbon nanodiamonds [10], graphene [11], graphene quantum dots [12], carbon dots [13][14][15], carbon nanofiber [16], and carbon nanocubes [17] have attracted a great concern in the diverse fields of science and technology because of their potential applications [5,[18][19][20][21]. Based on the few published reports, CNRs exhibited impressive electrical, thermal, and mechanical properties and are promising for field emission devices [22], energy storage devices [23], composite materials [24], and sensing applications [2].…”

“…The photoluminescent properties of wsCNRs were further utilized to construct a selective, specific, and active sensor for DNA sensing based upon fluorescent "turn-off/turn-on" technique [2]. The possible reasons for multicolored emissions from the single nanoparticle were attributed to the radiative recombination of photoinduced 2 International Journal of Photoenergy electrons and holes that present over the surface in the form of "surface defects" [9,14,20]. These surface defects can be confirmed via various microscopic and spectroscopic techniques.…”