Green synthesis of carbon dots from Ocimum sanctum for effective fluorescent sensing of Pb2+ ions and live cell imaging

Natural‐Product‐Derived Carbon Dots: From Natural Products to Functional Materials

“…report the first method to detect Pb 2 + by using NCDsp repared from Ocimums anctum. [108] Li et al outline am ethod to prepare N-doped NCDs by hydrothermalt reatment of cocoons ilk and show that these NCDs can be successfully used to image living cellsa nd MCF-7 breasta denocarcinoma cell tissues at ad epth of 60-120 mm (Figure 10 b). [68] The N-doped NCDs can also be used as af luorescent probe for the detection of Hg 2 + and Fe 3 + ions (Figure 10 c, d).B esides this, Gu et al describe the use of microwave irradiation to prepareN CDs from lotus root to detect Hg 2 + ions.…”

Hydrothermal Synthesis to Water-stable Luminescent Carbon Dots from Acerola Fruit for Photoluminescent Composites Preparation and its Application as Sensors

“…The highest PL intensity of C-dots was observed at an excitation wavelength of 360 nm due to the largest number of particles being excited at that wavelength. Another reason for the excitation dependent PL behavior of C-dots is the nature of their surface [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] . The presence of various functional groups on the surface of the C-dots may result in a series of emissive traps between π -π* transitions of C-C. From the digital images presented in inset of Figure 1A, the diluted C-dots solution is tawny under ambient daylight but exhibits strong green photoluminescence emission under UV light (365 nm), which confirmed the good fluorescent property of C-dots produced via green method.…”

“…Photoluminescent carbon dots (C-dots), a relatively new member of the carbon nanomaterial family, were firstly produced during purification of single-walled carbon nanotubes by Xu et al 1 in 2004. C-dots are oxygenous carbon nanoparticles with a size of less than 10 nm with quasi spherical morphology 2,3 Their excellent photoluminescence properties and tunable fluorescence emission, sensitive not only to the size of the carbon particles, but also to the presence of different analytes (e.g., metal ions, anions) have made this material class widely used as fluorescent labels as well as for chemical sensing applications 4 . Just like heavy-metal-based quantum dots (QDs), they exhibit several promising advantages over organic fluorescence dyes, such as tunable luminescence emission, good solubility in hydrophilic solvents, high stability against photo bleaching and blinking.…”

“…Just like heavy-metal-based quantum dots (QDs), they exhibit several promising advantages over organic fluorescence dyes, such as tunable luminescence emission, good solubility in hydrophilic solvents, high stability against photo bleaching and blinking. Nevertheless, the exceptional physicochemical properties such as an excellent water dispersibility (due to the abundant hydrophilic groups on their surface), robust chemical inertness, low toxicity and good biocompatibility, which makes them superior to metal quantum dots 2,3,5 .…”

“…C-dots are becoming a good alternative for novel fluorescent probes and optical sensors, as a consequence of tunable PL and good biocompatibility 2,3,4 . Recently, C-dots have been demonstrated the use as probes sensitive and selective detection of different ions, such as (Hg 2+ ) 15,16,17 , (Cu 2+ ) 18,19 , (Fe 3+ ) 20 , (Cr 6+ ) 21 , (Be 2+ ) 22 ions.…”