Shifting and non-shifting fluorescence emitted by carbon nanodots

Long, Yanmin; Zhou, Chuan-Hua; Zhang, Zhiling; Tian, Zhi‐Quan; Bao, Lei; Lin, Yi; Pang, Dai‐Wen

doi:10.1039/c2jm30639e

Cited by 176 publications

(103 citation statements)

References 30 publications

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“…With permission from [71] on the surface. Very similar observations were made by Long et al, who used carbon paste electrodes for the electrochemical fabrication of CDs [27]. They were able to control the CD surface to either show spectral red shifting of their luminescence or not.…”

Section: Photoluminescencesupporting

confidence: 59%

“…These CDs have an average size of 2.0 nm, emit blue luminescence under UV excitation, and also show electrochemiluminescence (ECL). With a similar strategy carbon paste electrodes have been used as starting material for electrochemical preparation of CDs by oxidation at +9 V vs. standard calomel electrode potential (SCE) in 0.1 M NaH 2 PO 4 aqueous solution [27]. The formation of CDs is also possible through the electrochemical oxidation of water which leads to the formation of hydroxyl and oxygen radicals that attack the anode and generate water-soluble CDs.…”

Section: Top-down Preparation Of Cdsmentioning

confidence: 99%

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Carbon Nanodots: Synthesis, Characterization, and Bioanalytical Applications

Lemberger

Hirsch

Wegener

2014

Measuring Biological Impacts of Nanomaterials

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Carbon dots (CDs) are a new class of carbon-rich nanoparticles with exciting physicochemical properties that make them an interesting material for bioanalytical applications. Since their first description in 2004, several preparation techniques have been developed and described in literature, either starting from carbon raw materials (e.g., soot, graphite) or molecular precursors (e.g., carbohydrates, citric acid). The resulting particles are typically only a few nanometers in size, and their surfaces are decorated with functional groups that are rich in oxygen. The presence of oxygenated functionalities on the surface renders the particles dispersible in water. Carbon dots contain a fraction of carbon atoms that are sp 2 hybridized with delocalized electrons on the surface -the basis for the particles' characteristic photoluminescence. The wavelength of the emitted light is dependent on the wavelength of the excitation source and shows remarkable photostability. Carbon dots are also readily excited in the NIR but still emit visible light (upconverted photoluminescence) which provides significant advantages for in vivo imaging. Nowadays CDs are considered as emerging tools in luminescence-based bioanalytics with their full potential yet to be discovered.

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Section: Photoluminescencesupporting

confidence: 59%

Section: Top-down Preparation Of Cdsmentioning

confidence: 99%

Carbon Nanodots: Synthesis, Characterization, and Bioanalytical Applications

Lemberger

Hirsch

Wegener

2014

Measuring Biological Impacts of Nanomaterials

View full text Add to dashboard Cite

show abstract

“…It is M a n u s c r i p t 12 similar to most of the reported photoluminescent C-dots [29] and G-dots [30] , the PL of our C-dots is also excitation dependent ( Figure 1B), which is generally believed that is attributed to the optical selection of differently-sized nanoparticles (quantum effect) and different emissive traps on the C-dots surface [31][32] . Due to their brightness in blue color, the as-prepared C-dots can act as fluorescent ink as demonstrated in Figure 2C and 2D.…”

Section: Optical Propertymentioning

confidence: 53%

One-step, green, and economic synthesis of water-soluble photoluminescent carbon dots by hydrothermal treatment of wheat straw, and their bio-applications in labeling, imaging, and sensing

Yuan

Zhong

Gao

et al. 2015

Applied Surface Science

149

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“…This behavior was in contrast with most of the reported data on carbon nanoparticles [1,16,17], where PL emission was red-shifted as the excitation maximum was red shifted. It has been suggested that a low surface oxidation degree in carbon nanoparticles results in a PL emission independent on the excitation wavelength [18]. It is a reasonable explanation taking into account the mild temperature conditions used to synthetize the CNP 180 .…”

Section: Spectroscopic Characterization Of Carbon-nanoparticles In Aqmentioning

confidence: 98%