Low temperature synthesis of phosphorous and nitrogen co-doped yellow fluorescent carbon dots for sensing and bioimaging

Gong, Xiaojuan; Lü, Wenjing; Liu, Yang; Li, Zengbo; Shuang, Shaomin; Dong, Chuan; Choi, Martin M. F.

doi:10.1039/c5tb00575b

Cited by 152 publications

(70 citation statements)

References 64 publications

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“…P,N-doped C-dots with satisfactory quantum yield have been prepared via one-step acidic oxidation of pumpkin by H 3 PO 4 at low temperature (90 °C) by Gong et al 158 The assynthesized P,N-doped C-dots exhibit fluorescence around 550 nm with a quantum yield of 9.42% without surface passivation, and have excitation wavelength dependent PL behavior. It was observed that P,N-doped C-dots are superior fluorescent bioimaging agents due to their excellent solubility and ultralow toxicity.…”

Section: Boron/nitrogenmentioning

confidence: 99%

Improving the functionality of carbon nanodots: doping and surface functionalization

et al. 2016

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Distinct from conventional carbon nanostructures, such as fullerene, graphene, and carbon nanotubes, carbon nanodots (C-dots) exhibit unique properties such as strong fluorescence, high photostability, chemical inertness, low toxicity, and biocompatibility. Various synthetic routes for C-dots have been developed in the last few years, and now intense research efforts have been focused on improving their functionality. In this aspect, doping and surface functionalization are two major ways to control the chemical, optical, and electrical properties of C-dots. Doping introduces atomic impurities into C-dots to modulate their electronic structure, and surface functionalization modifies the C-dot surface with functional molecules or polymers. In this review, we summarize recent progress in doping and surface functionalization of C-dots for improving their functionality, and offer insight into controlling the properties of C-dots for a variety of applications ranging from biomedicine to optoelectronics to energy.

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Section: Boron/nitrogenmentioning

confidence: 99%

Improving the functionality of carbon nanodots: doping and surface functionalization

et al. 2016

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“…Amjadi and his coworkers have applied a simple and green hydrothermal method to synthesize N‐doped CDs, which were then used as a fluorescent chemosensor for thioridazine hydrochloride determination in human serum samples . The P and N co‐doped yellow fluorescent CDs prepared by Gong et al have been applied as fluorescent bioimaging agents in animals and cells …”

Section: Introductionmentioning

confidence: 99%

Boron and nitrogen co‐doped carbon dots as a sensitive fluorescent probe for the detection of curcumin

Bian

Wang

et al. 2017

Luminescence

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In this present study, a fluorescent probe was developed to detect curcumin, which is derived from the rhizomes of the turmeric. We used a simple and economical way to synthesize boron and nitrogen co-doped carbon dots (BNCDs) by microwave heating. The maximum emission wavelength of the BNCDs was 450 nm at an excitation wavelength of 360 nm. The as-prepared BNCDs were characterized by multiple analytical techniques such as transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and infrared spectroscopy. Curcumin is a biologically active constituent of turmeric [1] which exhibits some biological and pharmacological activities such as antiinflammatory, [2] anti-ischemic, [3] antibacterial, [4] hepatoprotective, [5] anticarcinogenic, [6] and anti-dyspeptic [7] properties. It has also been reported that curcumin resists the formation of free radicals effectively such as superoxide radicals and hydroxyl radicals in blood and body tissues. [8,9] Due to the widespread application of curcumin in pharmacology and clinical medicine, much attention has been paid by researchers. Therefore, many methods for the detection of curcumin have been developed, including capillary electrophoresis, [10] high-performance thin-layer chromatographic, [11] high-performance liquid chromatography, [12,13] voltammetry, [14] liquid-liquid microextraction, [15] liquid chromatography-mass spectrometry, [16,17] and electrochemical techniques. [18] However, the majority of these Abbreviations used: BNCD, boron and nitrogen co-doped carbon dot; BSA, bovine serum albumin; CD, carbon dot; IFE, inner filter effect; PBS, phosphatebuffered solution; IR, infra-red; QY, quantum yield; TEM, transmission electron microscopy; UV, ultraviolet; XPS, X-ray photoelectron spectroscopy; XRD, X-ray diffraction.

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“…[35][36][37] Thesurface groups and chemical compositions of the URTP CDs are followed identified by Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) spectra. [38,39] Thepeak located at 1633 cm À1 corresponds to the bending vibration of N À Ho r stretching vibration of C = N. [40] Theabsorption peaks at 1464, 1267, 1085, and 1008 cm À1 could be attributed to the bending vibration of CÀH, stretching vibrations of P=O/CÀN, CÀO/PÀO, and PÀN, respectively. [38,39] Thepeak located at 1633 cm À1 corresponds to the bending vibration of N À Ho r stretching vibration of C = N. [40] Theabsorption peaks at 1464, 1267, 1085, and 1008 cm À1 could be attributed to the bending vibration of CÀH, stretching vibrations of P=O/CÀN, CÀO/PÀO, and PÀN, respectively.…”

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confidence: 99%

“…As seen in Figure 2d,the CDs display ab road FT-IR absorption band at approximately 2500-3500 cm À1 (containing distinguishable peaks at 3413, 3228, 3047, and 2862 cm À1 ), resulting from the stretching vibrations of -OH, -NH 2 , and -CH 2 -groups. [38][39][40][41][42] Finally,t he absorption peaks at 2476 and 524 cm À1 imply the presence of amine and phosphate salts, [41] respectively,which indicates agood dispersity of the CDs in water. [38][39][40][41][42] Finally,t he absorption peaks at 2476 and 524 cm À1 imply the presence of amine and phosphate salts, [41] respectively,which indicates agood dispersity of the CDs in water.…”

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confidence: 99%

Facile, Quick, and Gram‐Scale Synthesis of Ultralong‐Lifetime Room‐Temperature‐Phosphorescent Carbon Dots by Microwave Irradiation

et al. 2018

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Long-lifetime room-temperature phosphorescence (RTP) materials are important for many applications, but they are highly challenging materials owing to the spin-forbidden nature of triplet exciton transitions. Herein, a facile, quick and gram-scale method for the preparation of ultralong RTP (URTP) carbon dots (CDs) was developed via microwave-assisted heating of ethanolamine and phosphoric acid aqueous solution. The CDs exhibit the longest RTP lifetime, 1.46 s (more than 10 s to naked eye) for CDs-based materials to date. The doping of N and P elements is critical for the URTP which is considered to be favored by a n→π* transition facilitating intersystem crossing (ISC) for effectively populating triplet excitons. In addition, possibilities of formation of hydrogen bonds in the interior of the CDs may also play a significant role in producing RTP. Potential applications of the URTP CDs in the fields of anti-counterfeiting and information protection are proposed and demonstrated.

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Low temperature synthesis of phosphorous and nitrogen co-doped yellow fluorescent carbon dots for sensing and bioimaging

Cited by 152 publications

References 64 publications

Improving the functionality of carbon nanodots: doping and surface functionalization

Improving the functionality of carbon nanodots: doping and surface functionalization

Boron and nitrogen co‐doped carbon dots as a sensitive fluorescent probe for the detection of curcumin

Facile, Quick, and Gram‐Scale Synthesis of Ultralong‐Lifetime Room‐Temperature‐Phosphorescent Carbon Dots by Microwave Irradiation

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