Concentration effect on optical properties of carbon dots at room temperature

Isnaeni, Isnaeni; Herbani, Yuliati; Suliyanti, Maria Margaretha

doi:10.1016/j.jlumin.2018.02.012

Cited by 52 publications

(29 citation statements)

References 14 publications

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“…The electronic transition that involved (σ and π) bond, (σ * and π *) anti-bond and non-bonded orbital (n). but, π → π * and n → π * transition was very important for the energy transition of the C-dots agreement with the wavelength of visible light which appropriated with photoluminescence characteristic at visible light spectra region [23,24]. Nonetheless, n → π * electronic transition was dominated in the C-dots absorbance spectra.…”

Section: The Uv-vis Spectroscopy Analysissupporting

confidence: 62%

Spectroscopy Study of Polyvinyl Alcohol/Carbon Dots Composite Films

Putro

Yudasari

Isnaeni

et al. 2021

Walailak J Sci & Tech

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The unique characteristic of carbon dots (C-dots), such as optical and electrical properties, have been integrated into polyvinyl alcohol (PVA) to realize composites with synergistic. In this work, C-dots have been synthesized from inner cassava peels using simple methods at low temperatures. The C-dots were added to PVA, which is influenced the characteristic based on spectroscopy. The complex formation between PVA and C-dots was investigated by FTIR spectroscopy. The C-dots contributed to UV-Vis spectroscopy characteristic of PVA/C-dots with the absence of a new peak of absorbance spectra. Besides, C-dots also supported the electrochemical impedance spectroscopy characteristic of PVA/C-dots, so the highest ionic conductivity is induced by the enhancement of amorphous PVA when the c-dots content is increased.

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Section: The Uv-vis Spectroscopy Analysissupporting

confidence: 62%

Spectroscopy Study of Polyvinyl Alcohol/Carbon Dots Composite Films

Putro

Yudasari

Isnaeni

et al. 2021

Walailak J Sci & Tech

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“…The peak at 225 nm was originated from the σ–σ* energy transition. 31 So, σ–σ*, n−π*, and π–π* energy transitions can be seen clearly with different dilution factors.…”

Section: Resultsmentioning

confidence: 91%

Cranberry Beans Derived Carbon Dots as a Potential Fluorescence Sensor for Selective Detection of Fe³⁺ Ions in Aqueous Solution

et al. 2019

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Recently, synthesis, characterization, and application of carbon dots have received much attention. Natural products are the effectual carbon precursors to synthesize carbon dots with fascinating chemical and physical properties. In this study, the fluorescent sensor of carbon dots derived from cranberry beans without any functionalization and modification was developed. The carbon dots were prepared with a cheap, facile, and green carbon precursor through a hydrothermal treatment method. The synthetic process was toxic chemical-free, convenient, and environmentally friendly. To find the optimized synthetic conditions, the temperature, heating time duration, and carbon precursor weight were evaluated. The prepared carbon dots were characterized by UV light, transmission electron microscopy, Raman, Fourier transform infrared, UV–vis, and fluorescence spectroscopy. The resulting carbon dots exhibit stable fluorescence with a quantum yield of approximately 10.85%. The carbon dots emitted the broad fluorescence emission range between 410 and 540 nm by changing the excitation wavelength and were used for the detection of Fe3+ ions at the excitation of 380 nm. It is found that Fe3+ ions induced the fluorescence intensity quenching of the carbon dots stronger than other heavy metals and the Fe3+ ion detection can be achieved within 3 min. Spectroscopic data showed that the obtained carbon dots can detect Fe3+ ions within the wide concentration range of 30–600 μM with 9.55 μM detection limit.

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“…Isnaeni et al synthesized CDs from microwave-assisted treatment of commercial white sugar and observed that as the CD concentration increased, PL intensity increased and peak wavelength shifted to longer wavelength, which was presumably attributed to energy transition at the CD surfaces [48].…”

Section: Synthesis Methods Of Carbon Dotsmentioning

confidence: 99%

“…Not only from dual precursors, CDs have also been prepared from single small molecules (Table 2), such as amino acids [6,36,55], small carbohydrates [38,48,55], or other low molecular weight chemicals [7,8,35,51,55]. For example, histidine was used to prepare CDs (3–5 nm, QY of 10.7%) by hydrothermal approach [6].…”

Section: Materials For Carbon Dot Synthesismentioning

confidence: 99%

Recent Progress of Carbon Dot Precursors and Photocatalysis Applications

et al. 2019

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Carbon dots (CDs), a class of carbon-based sub-ten-nanometer nanoparticles, have attracted great attention since their discovery fifteen years ago. Because of the outstanding photoluminescence properties, photostability, low toxicity, and low cost, CDs have potential to replace traditional semiconductor quantum dots which have serious drawbacks of toxicity and high cost. This review covers the common top-down and bottom-up methods for the synthesis of CDs, different categories of CD precursors (small molecules, natural polymers, and synthetic polymers), one-pot and multi-step methods to produce CDs/photocatalyst composites, and recent advances of CDs on photocatalysis applications mostly in pollutant degradation and energy areas. A broad range of precursors forming fluorescent CDs are discussed, including small molecule sole or dual precursors, natural polymers such as pure polysaccharides and proteins and crude bio-resources from plants or animals, and various synthetic polymer precursors with positive, negative, neutral and hydrophilic, hydrophobic, or zwitterionic feature. Because of the wide light absorbance, excellent photoluminescence properties and electron transfer ability, CDs have emerged as a new type of photocatalyst. Recent work of CDs as sole photocatalyst or in combination with other materials (e.g., metal, metal sulfide, metal oxide, bismuth-based semiconductor, or other traditional photocatalysts) to form composite catalyst for various photocatalytic applications are reviewed. Possible future directions are proposed at the end of the article on mechanistic studies, production of CDs with better controlled properties, expansion of polymer precursor pool, and systematic studies of CDs for photocatalysis applications.

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Concentration effect on optical properties of carbon dots at room temperature

Cited by 52 publications

References 14 publications

Spectroscopy Study of Polyvinyl Alcohol/Carbon Dots Composite Films

Spectroscopy Study of Polyvinyl Alcohol/Carbon Dots Composite Films

Cranberry Beans Derived Carbon Dots as a Potential Fluorescence Sensor for Selective Detection of Fe³⁺ Ions in Aqueous Solution

Recent Progress of Carbon Dot Precursors and Photocatalysis Applications

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Concentration effect on optical properties of carbon dots at room temperature

Cited by 52 publications

References 14 publications

Spectroscopy Study of Polyvinyl Alcohol/Carbon Dots Composite Films

Spectroscopy Study of Polyvinyl Alcohol/Carbon Dots Composite Films

Cranberry Beans Derived Carbon Dots as a Potential Fluorescence Sensor for Selective Detection of Fe3+ Ions in Aqueous Solution

Recent Progress of Carbon Dot Precursors and Photocatalysis Applications

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Cranberry Beans Derived Carbon Dots as a Potential Fluorescence Sensor for Selective Detection of Fe³⁺ Ions in Aqueous Solution