Carbon Dots: A New Type of Carbon-Based Nanomaterial with Wide Applications

ACS Central Science, Год журнала: 2020, Номер 6(12), С. 2179 - 2195

Опубликована: Дек. 14, 2020

Carbon dots (CDs), as a new type of carbon-based nanomaterial, have attracted broad research interest for years, because their diverse physicochemical properties and favorable attributes like good biocompatibility, unique optical properties, low cost, ecofriendliness, abundant functional groups (e.g., amino, hydroxyl, carboxyl), high stability, electron mobility. In this Outlook, we comprehensively summarize the classification CDs based on analysis formation mechanism, micro-/nanostructure property features, describe synthetic methods including strong absorption, photoluminescence, phosphorescence. Furthermore, recent significant advances in applications, (sensor, anticounterfeiting), energy (light-emitting diodes, catalysis, photovoltaics, supercapacitors), promising biomedicine, are systematically highlighted. Finally, envisage key issues to be challenged, future directions, perspectives show full picture CDs-based materials.

Язык: Английский

---

The light of carbon dots: From mechanism to applications

Matter, Год журнала: 2022, Номер 5(1), С. 110 - 149

Опубликована: Янв. 1, 2022

Язык: Английский

---

Tailored Fabrication of Carbon Dot Composites with Full‐Color Ultralong Room‐Temperature Phosphorescence for Multidimensional Encryption

Advanced Science, Год журнала: 2021, Номер 9(3)

Опубликована: Ноя. 19, 2021

Abstract Ultralong room‐temperature phosphorescence (RTP) is highly useful for information encryption, organic electronics, bioelectronics, etc. However, the preparation of related metal‐free materials with multiple colors across full spectrum remains a major challenge. Herein, facile method developed to fabricate boron‐doped carbon dot (B‐CD) composites full‐color long lifetime RTP continuously tailorable in range 466–638 nm simply by pyrolysis citric acid and boric precursors various mass ratios at different temperatures. This leads formation luminescent B‐CD centers rigid polycrystalline B 2 O 3 matrix, which effectively stabilizes triplet excited states B‐CDs. Thus, become phosphorescent over relatively period (5–12 s) after removal irradiation source. Meanwhile, increased particle size oxidation degree B‐CDs obtained larger feeding or higher temperature shift from blue red. Due luminescence centers, can also be finely modulated excitation wavelength. The resulting tunable further allow variety distinctive applications multidimensional encryption handily utilizing space, time, color variations.

Язык: Английский

---

The Emerging Development of Multicolor Carbon Dots

Small, Год журнала: 2022, Номер 18(51)

Опубликована: Ноя. 3, 2022

Abstract As a relatively new type of fluorescent carbon‐based nanomaterials, multicolor carbon dots (MCDs) have attracted much attention because their excellent biocompatibility, tunable photoluminescence (PL), high quantum yield, and unique electronic physicochemical properties. The emission characteristics (CDs) obviously depend on the source precursor, reaction conditions, environment, which directly or indirectly determines CDs. Therefore, this review is first systematic classification summary multiple regulation methods synthetic MCDs reviews recent research progress in synthesis from variety precursor materials such as aromatic molecules, small organic natural biomass, focusing how different produce corresponding MCDs. This also introduces innovative applications fields biological imaging, light‐emitting diodes (LEDs), sensing, anti‐counterfeiting due to PL It hoped that by selecting appropriate adjustment methods, can inspire guide future design tailored MCDs, provide help for development multifunctional

Язык: Английский

---

Colour-tunable ultralong-lifetime room temperature phosphorescence with external heavy-atom effect in boron-doped carbon dots

Chemical Engineering Journal, Год журнала: 2020, Номер 420, С. 127647 - 127647

Опубликована: Ноя. 6, 2020

Язык: Английский

---

Theoretical Understanding of Structure–Property Relationships in Luminescence of Carbon Dots

The Journal of Physical Chemistry Letters, Год журнала: 2021, Номер 12(32), С. 7671 - 7687

Опубликована: Авг. 5, 2021

Carbon dots (CDs) have excellent luminescence characteristics, such as good light stability, high quantum yield (QY), long phosphorescence lifetime, and a wide emission wavelength range, resulting in CDs' great success optical applications. Understanding the structure–property relationships CDs is essential for their use optoelectronic However, because of complex nature CD structures synthesis processes, understanding mechanism big challenge. This Perspective reviews theoretical efforts toward discusses challenges that need to be overcome future development CDs.

Язык: Английский

---

Aggregation and luminescence in carbonized polymer dots

Aggregate, Год журнала: 2022, Номер 3(2)

Опубликована: Янв. 20, 2022

Abstract The aggregate luminescence behavior of organic luminescent materials has been studied extensively. As a new kind nanomaterials, carbonized polymer dots (CPDs) not only inherit the stability and biocompatibility carbon materials, but also possess tunability, water solubility, high photoluminescence quantum yield rendering them strong candidate for next generation light‐emitting materials. Previously, people mainly understood its from perspective some mechanisms are still unclear. In this review, we discuss mechanism by referring to with emphasis on their aggregation behavior. Firstly, three representative phenomena briefly introduced. Chromophores present in CPDs elaborated further potential interactions between them, role crosslinked networks. On basis, special state summarized, relevant discussed detail consolidate statements.

Язык: Английский

---

Zero-Dimensional Carbon Nanomaterials for Fluorescent Sensing and Imaging

Chemical Reviews, Год журнала: 2023, Номер 123(18), С. 11047 - 11136

Опубликована: Сен. 7, 2023

Advances in nanotechnology and nanomaterials have attracted considerable interest play key roles scientific innovations diverse fields. In particular, increased attention has been focused on carbon-based exhibiting extended structures unique properties. Among these materials, zero-dimensional structures, including fullerenes, carbon nano-onions, nanodiamonds, dots, possess excellent bioaffinities superior fluorescence properties that make suitable for application to environmental biological sensing, imaging, therapeutics. This review provides a systematic overview of the classification structural properties, design principles preparation methods, optical sensing applications nanomaterials. Recent interesting breakthroughs sensitive selective imaging heavy metal pollutants, hazardous substances, bioactive molecules as well information encryption, super-resolution photoacoustic phototherapy nanomedicine delivery are main focus this review. Finally, future challenges prospects materials highlighted envisaged. presents comprehensive basis directions designing, developing, applying fascinating fluorescent sensors fabricated based specific requirements numerous research

Язык: Английский

---

A Molecular Engineering Strategy for Achieving Blue Phosphorescent Carbon Dots with Outstanding Efficiency above 50%

Advanced Materials, Год журнала: 2022, Номер 35(6)

Опубликована: Ноя. 22, 2022

Highly efficient emission has been a long-lasting pursuit for carbon dots (CDs) owing to their enormous potential in optoelectronic applications. Nevertheless, room-temperature phosphorescence (RTP) performance still largely lags behind outstanding fluorescence emission, especially the blue spectral region. Herein, high-efficiency RTP CDs have designed and constructed via simple molecular engineering strategy, enabling with an unprecedented quantum efficiency of 50.17% long lifetime 2.03 s. This treating route facilitates formation high-density (n, π*) configurations CD π-π conjugate system through introduction abundant functional groups, which can evoke strong spin-orbit coupling further promote intersystem crossing from singlet triplet excited states radiative recombination ground state. With phosphorescent as donors, green, red, white afterglow composites are successfully fabricated effective Förster resonance energy transfer. Importantly, color temperature be widely facilely tuned cool pure warm white. Moreover, advanced information encryption, light illumination, afterglow/dynamic visual display demonstrated when using these multicolor-emitting CD-based systems.

Язык: Английский

---

Near‐Infrared‐Excited Multicolor Afterglow in Carbon Dots‐Based Room‐Temperature Afterglow Materials

Angewandte Chemie International Edition, Год журнала: 2021, Номер 60(41), С. 22253 - 22259

Опубликована: Авг. 14, 2021

Abstract Room‐temperature afterglow (RTA) materials with long lifetime have shown tremendous application prospects in many fields. However, there is no general design strategy to construct near‐infrared (NIR)‐excited multicolor RTA materials. Herein, we report a universal approach based on the efficient radiative energy transfer that supports reabsorption from upconversion (UMs) carbon dots‐based (CDAMs). Thus, emission (blue, cyan, green, and orange) of various CDAMs can be activated by UMs under NIR continuous‐wave laser excitation. The ensured persistent up 7 s, 6 5 0.5 s naked eyes, respectively. Given unusual properties, demonstrated preliminary applications fingerprint recognition information security. This work provides new avenue for activation NIR‐excited will greatly expand

Язык: Английский

---