Polyamine-functionalized carbon quantum dots for chemical sensing

Dong, Yongqiang; Wang, Ruixue; Li, Hao; Shao, Jingwei; Chi, Yuwu; Lin, Xiaomei; Chen, Guonan

doi:10.1016/j.carbon.2012.02.046

Cited by 552 publications

(366 citation statements)

References 28 publications

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“…The survey XPS spectrum of CQDs in Figure 4A clearly shows three peaks at 284.58, 400.75, and 531.34 eV, for C 1s, N 1s, and O 1s, respectively. 18 A highresolution XPS spectrum of C 1s ( Figure 4B Figure S1) can be assigned to C=O and C-OH/C-O-C groups, respectively. The XPS analysis clearly indicates the presence of oxygen-containing groups in the as-prepared CQDs, such as -COOH, -OH, -C-N, and so on, which is in good agreement with the FTIR spectrum.…”

Section: Xps Characterizationmentioning

confidence: 99%

“…[14][15][16] In 2006, Sun et al first proved that surface passivation of CQDs with poly(ethylene) glycol diamine can remarkably enhance their fluorescence quantum yields. [17][18][19][20] More recently, heteroatom-doped CQDs have attracted much attention, as they can effectively modulate the intrinsic properties of CQDs, such as electronic characteristics and local surface chemical features, and sometimes may provide CQDs with additional properties. 21,22 For example, N-, B-, P-, S-, or Si-doped…”

Section: Introductionmentioning

confidence: 99%

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Facile synthesis of N-rich carbon quantum dots from porphyrins as efficient probes for bioimaging and biosensing in living cells

Wang

et al. 2017

IJN

141

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N-rich metal-free and metal-doped carbon quantum dots (CQDs) have been prepared through one-step hydrothermal method using tetraphenylporphyrin or its transition metal (Pd or Pt) complex as precursor. The structures and morphology of the as-prepared nanoparticles were analyzed by X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectra. Three kinds of nanocomposites show similar structures except for the presence of metal ions in Pd-CQDs and Pt-CQDs indicated by X-ray photoelectron spectroscopy. All of them display bright blue emission upon exposure to ultraviolet irradiation. The CQDs exhibit typical excitation-dependent emission behavior, with the emission quantum yield of 10.1%, 17.8%, and 15.2% for CQDs, Pd-CQDs, and Pt-CQDs, respectively. Moreover, the CQDs, Pd-CQDs, and Pt-CQDs could serve as fluorescent probes for the specific and sensitive detection of Fe 3+ ions in aqueous solution. The low cytotoxicity of CQDs is demonstrated by MTT assay against HeLa cells. Therefore, the CQDs can be used as efficient probes for cellular multicolor imaging and fluorescence sensors for the detection of Fe 3+ ions due to their low toxicity, excellent biocompatibility, and low detection limits. This work provides a new route to synthesize highly luminescent N-rich metal-free or metal-doped CQDs for multifunctional applications.

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Section: Xps Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facile synthesis of N-rich carbon quantum dots from porphyrins as efficient probes for bioimaging and biosensing in living cells

Wang

et al. 2017

IJN

141

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“…The similar CL behavior of naked CDs induced by Fenton-like reaction was also appeared, but the CL intensity was lower about 10 times than that of BPEICDs (Fig. 3d), which probably because BPEI capped on the surface of CDs can capture and enrich the Fe 3+ ions [27]. Additionally, the BPEI-CDs had a higher quantum yield than naked CDs as described before [28].…”

Section: Two-step CL Of Bpei-cds Induced By Fenton-like Reactionmentioning

confidence: 58%

“…The polyamine-functionalized carbon dots (BPEI-CDs) were synthesized by the pyrolysis of citric acid and BPEI according to the manuscript with some modification [27]. The high resolution TEM image (Fig.…”

Section: Characterization Of Bpei-cdsmentioning

confidence: 99%

“…Herein, we surprisingly found an unprecedented two-step CL phenomenon of CDs and polyamine-functionalized-CDs (BPEI-CDs) induced by Fenton-like reaction such as Fe 3+ -H 2 O 2 system. Especially for BPEI-CDs, the CL intensity was higher than the naked CDs probably due to its high quantum yield [27]. Therefore, using BPEI-CDs as model, The two-step CL mechanism of BPEI-CDs-Fe 3+ -H 2 O 2 CL system was preliminarily studied through fluorescence, CL emission spectrum and the effects of radical scavengers on CL intensity, which may further facilitate full understanding the physical-chemical and optical properties of the carbon dots.…”

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confidence: 99%

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Unprecedented Two-Step Chemiluminescence of Polyamine-Functionalized Carbon Nanodots Induced by Fenton-Like System

et al. 2017

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Carbon‐Based Luminescent Nanosensors

López‐Lorente

2016

Encyclopedia of Analytical Chemistry

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Carbon nanomaterials have raised great attention in the past years for the development of luminescent nanosensors. These nanomaterials possess excellent photoluminescence properties, which combined with their low cytotoxicity and high biocompatibility make them ideal platforms for (bio)sensing. In this article, we have focused on recently developed fluorescent carbon nanomaterials such as graphene quantum dots, graphene oxide, and carbon dots, which have emerged as alternative to conventional dyes and semiconductor quantum dots. The different mechanisms underlying the sensors are discussed and examples of (bio)sensors involving these nanomaterials are described. The combination of two nanomaterials in the same sensing scheme has been widely employed in the past years combining both the emission properties of nanomaterials and their quenching ability. Finally, examples of sensors based on carbon nanomaterials developed for the determination of other nanomaterials of the same or different nature are presented.

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Polyamine-functionalized carbon quantum dots for chemical sensing

Cited by 552 publications

References 28 publications

Facile synthesis of N-rich carbon quantum dots from porphyrins as efficient probes for bioimaging and biosensing in living cells

Facile synthesis of N-rich carbon quantum dots from porphyrins as efficient probes for bioimaging and biosensing in living cells

Unprecedented Two-Step Chemiluminescence of Polyamine-Functionalized Carbon Nanodots Induced by Fenton-Like System

Carbon‐Based Luminescent Nanosensors

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