Facilely synthesized N-doped carbon quantum dots with high fluorescent yield for sensing Fe<sup>3+</sup>

Yu, Jing; Xu, Chunxiang; Tian, Zhengshan; Lin, Yi; Shi, Zengliang

doi:10.1039/c5nj03252k

Cited by 142 publications

(59 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar to other CQDs reported in literature, [41][42][43] the asprepared CQDs and M-CQDs in aqueous solution exhibited strong luminescence. Figures 6A, S2, and S3 show the UVvis absorption, PL spectra, and excitation spectrum of the CQDs and M-CQDs in aqueous solution, respectively.…”

Section: Photophysical Propertiessupporting

confidence: 72%

See 1 more Smart Citation

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

154

View full text Add to dashboard Cite

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.

show abstract

Section: Photophysical Propertiessupporting

confidence: 72%

“…The significantly reduced lifetime indicates the occurrence of dynamic quenching and confirms that the electron transfer between Fe 3+ and CQDs contributes to the fluorescence quenching. 43,49 …”

Section: The Ion Sensing Of Cqdsmentioning

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

154

View full text Add to dashboard Cite

show abstract

“…The former signal corresponds to the π-π * transitions of conjugated systems, and the latter signal corresponds to the n-π * transition of the carbonyl groups. 25,41,42 The inset in Figure Figure 3. FTIR spectrum of the N-CQDs.…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

“…Modification of the surface properties could be achieved by doping the CQDs, often with nitrogen. 24,25 For example, it has been demonstrated that N-doping of CQDs increases quantum yield and electron transfer. 26 These N-doped CQDs (henceforth referred to as N-CQDs in this paper) possess unique properties like electrocatalytic activity, controllable luminescence and are also biologically benign.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Electrochemical UV Sensor Using Carbon Quantum Dot/Graphene Semiconductor

Wang

Myers

2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

Our group has developed an electrochemical UV sensor utilizing carbon quantum dots as the photoactive material functionalizing a graphene semiconductor layer. When used as a photoactive electrode in contact with a solid polymer electrolyte in a photoelectrochemical cell, illumination under UV radiation at 365 nm induces a photocurrent with a corresponding change in device voltage. The time-dependent change in voltage is a function of UV radiation intensity. Varying the UV LED power density from 26.6 mW/cm 2 (approximately 100% intensity) to 5.1 mW/cm 2 (approximately 20% intensity) results in time-dependent potential changes (dU/dt) ranging from approximately 4.0 mV/s to 0.5 mV/s. The dU/dt vs. LED power density trend is nearly linear (r 2 = 0.97). Similarly, when a constant bias potential is applied to the cell, a sustained photocurrent is observed under UV illumination, with the magnitude of the photocurrent a linear function of the LED power density. In that case, the coefficient of determination r 2 = 0.98. These results indicate that a graphene semiconductor, when functionalized with a photoactive material like carbon quantum dots, has application as a UV sensor with the ability to quantify the intensity of UV radiation. Nano-scale carbon-based materials, such as carbon quantum dots (CQDs), have received significant attention recently due to their unique optical and electronic properties.1 Depending on the particular synthesis procedure and the carbon source, carbon quantum dots can be environmentally and biologically benign.2 It is interesting to note that practically any carbon-containing material can be used as the source for carbon quantum dots. Literature reports on a host of starting materials exist. For example, Meiling and co-workers have used starch and tris-acetate-EDTA buffer as carbon sources.3 Du and co-workers prepared carbon quantum dots from orange pericarp in a hydrothermal treatment method. 4 Zhou, et al., used watermelon peel as a carbon source.5 Often, carbon quantum dots are simply obtained from more typical laboratory chemicals like citric acid. [6][7][8] There are also many possible CQD synthesis techniques, including hydrothermal methods, 9,10 electrochemical methods 11 and microwave-assisted methods.12,13 The combination of widely-variable carbon sources and facile synthesis procedures has ensured that CQD research continues to grow. It is likely that organic CQDs will make up a large share of the growing nanomaterial market. In fact, CQDs have been suggested as markers for biosensing and bioimaging, It is generally accepted that size and surface properties determine CQD optical and electronic behavior. Modification of the surface properties could be achieved by doping the CQDs, often with nitrogen. 24,25 For example, it has been demonstrated that N-doping of CQDs increases quantum yield and electron transfer.26 These N-doped CQDs (henceforth referred to as N-CQDs in this paper) possess unique properties like electrocatalytic activity, controllable luminescence and are also biologic...

show abstract

A Practical Guide to Prepare and Synthetically Modify Graphene Quantum Dots

Sweetman

Hickey

Brooks

et al. 2019

Adv Funct Materials

View full text Add to dashboard Cite

Due to the favorable properties of graphene quantum dots (GQDs), there has been a rapid development of sensors, devices, and composite materials, which incorporate this 0D nanomaterial. GQDs provide a means to instill superior optical, electronic, mechanical, and adsorptive properties to various platforms and have found use as biosensors, photovoltaic devices, polymer composites, and drug delivery vehicles. One of the key factors to successfully integrating GQD technology is the intelligent choice of synthetic chemical pathways to fabricate, modify, and instill functionality in the developed platform. GQDs are decorated with a variety of functional groups that are amenable to traditional synthetic chemistry transformations; however, the technology for post-synthetic modifications is only in its infancy. Herein, a comprehensive analysis of the chemistry available for modifying GQDs is provided; starting from methods for GQD fabrication and synthetic chemical pathways for producing functional GQDs, to the advantages, disadvantages, and challenges of specific chemistries, and finally techniques for the appropriate characterization of these functional materials. This review is meant for researchers considering entering the GQD field, as well as those more experienced, providing a practical guide on how to prepare, modify, and characterize GQDs for a broad range of applications.

show abstract

Facilely synthesized N-doped carbon quantum dots with high fluorescent yield for sensing Fe³⁺

Abstract: Schematic illustration of the preparation process for the NCQDs and their application for Fe3+ ions detection.

Cited by 142 publications

References 50 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

Electrochemical UV Sensor Using Carbon Quantum Dot/Graphene Semiconductor

A Practical Guide to Prepare and Synthetically Modify Graphene Quantum Dots

Contact Info

Product

Resources

About

Facilely synthesized N-doped carbon quantum dots with high fluorescent yield for sensing Fe3+

Abstract: Schematic illustration of the preparation process for the NCQDs and their application for Fe3+ ions detection.

Cited by 142 publications

References 50 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

Electrochemical UV Sensor Using Carbon Quantum Dot/Graphene Semiconductor

A Practical Guide to Prepare and Synthetically Modify Graphene Quantum Dots

Contact Info

Product

Resources

About

Facilely synthesized N-doped carbon quantum dots with high fluorescent yield for sensing Fe³⁺