Carbon dots: building a robust optical shield for wood preservation

Han, Youqi; Wang, Yuning; Zhao, Bin; Bai, Yibing; Han, Shiyan; Zhang, Yahui; Li, Shujun; Chen, Zhijun; Si, Chuanling; Yu, Haipeng; Zhang, Chunlei; Yu, Wenji

doi:10.1007/s42114-022-00619-8

Cited by 30 publications

(21 citation statements)

References 49 publications

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“…S2 †), which means that short wavelength light is absorbed and converted into longer wavelength emission. 2,10,49 As the concentration of CNDs in the solution increases, the maximum emission redshis to longer wavelength (Fig. 2b and c) and the corresponding optimal excitation wavelength also redshis (Fig.…”

Section: Resultsmentioning

confidence: 95%

“…This may be caused by aggregation of CNDs at higher concentrations, leading to enhanced p-p* transitions of C]C bonds and n-p* transitions of C]O/C]N bonds. 10,49 The uorescence emission of aqueous solutions of CNDs is excitation wavelength-dependent (Fig. S2 †), which means that short wavelength light is absorbed and converted into longer wavelength emission.…”

Section: Resultsmentioning

confidence: 99%

“…These results indicate that the CND-lms may have potential applications in blocking UV and high-energy blue photons. 1,2,6,10 To further investigate the light absorption and conversion characteristics of the CND-lms, a 365 nm semiconductor chip (purple) was selected as the excitation source and different CND-lms were used to encapsulate the chip (Fig. 3d).…”

Section: Resultsmentioning

confidence: 99%

“…9 With the development of UV blocking materials, carbon nanodots (CNDs) have gradually been used to block high-energy short wavelength light due to their excellent optical absorption and conversion properties. 1,2,10,11 CNDs are a new type of carbon nanomaterial with a particle size <10 nm, excellent resistance to photobleaching and good responsiveness to changes in pH and temperature, [12][13][14][15][16] which are widely used in white light emitting diodes (WLEDs), [17][18][19][20] in anticounterfeiting applications, 21,22 as probes, [23][24][25] and catalysts, 26,27 and for biological imaging. 28,29 Among the many possible sources of carbon for preparing carbon dots, natural resources and derivatives are particularly attractive because of their abundance, low price, environmental friendliness and sustainability.…”

Section: Introductionmentioning

confidence: 99%

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Construction of composite films using carbon nanodots for blocking ultraviolet light from the Sun

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et al. 2023

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

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Section: Introductionmentioning

confidence: 99%

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Construction of composite films using carbon nanodots for blocking ultraviolet light from the Sun

Bai

Zhao

et al. 2023

RSC Adv.

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“…46 The existence of these functional groups leads to a diversity of the surface states of CQDs, which enhances their UV radiation absorption capacity. 47 Additionally, there is no noticeable difference in the position and intensity of the FT-IR peaks of CQDs before and after aging, suggesting the superior structural stability of CQD powder. XPS measurement (Figure 2e,f) is helpful to detect the surface composition of CQDs; the C 1s band shows three distinct peaks at around 284.8, 286.2, and 288.2 eV, assigned to C−C/C�C, C−N/C−O, and C�N/C�O, respectively.…”

Section: Resultsmentioning

confidence: 96%

Carbon Quantum Dots for Long-Term Protection against UV Degradation and Acidification in Paper-Based Relics

Zhang,

Zhao,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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Paper-based cultural relics constitute a significant and invaluable part of human civilization and cultural heritage. However, they are highly vulnerable to environmental factors such as ultraviolet (UV) photodegradation and acidification degradation, posing substantial threats to their long-term preservation. Carbon quantum dots (CQDs), known for their outstanding optical properties, high water solubility, and good safety, offer a promising solution for slowing down UV damage and acidification of paper-based relics during storage and transportation. Herein, we propose a feasible strategy for the simple preparation of CQDs with high dispersion stability, excellent UV absorption, room-temperature phosphorescence, and photostability for the safety protection of paper. Accelerated aging experiments were conducted using UV and dry-heat aging methods on both CQD-protected paper and unprotected paper, respectively, to evaluate the effectiveness of CQD protection. The results demonstrate a slowdown in both the oxidation and acid degradation processes of the protected paper under both UV-aging and dry-heat aging conditions. Notably, CQDs with complex luminescence patterns of both fluorescence and room-temperature phosphorescence also endue them as enhanced optical anticounterfeiting materials for multifunctional paper protection. This research provides a new direction for the protection of paper-based relics with emerging carbon nanomaterials.

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Efficient Protection of Paper‐Based Cultural Relics via In Situ Synthesis of Carbon Dots/Layered Double Hydroxide

Zhao,

Zhang,

Wang

et al. 2024

Adv Funct Materials

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Paper‐based cultural relics are of great value and have been facing irreversible damage caused by multiple factors, among which acid hydrolysis and ultraviolet photodegradation are the main processes leading to paper deterioration. Paper protection highly relies on a limited range of materials with single functions, and the design of new materials that ensure long‐term safety and efficiency by simultaneously addressing the issues of acidification and UV degradation in paper is highly desired. In this study, the introduction of carbon dots (CDs)‐enhanced layered double hydroxides (LDH) 0D/2D nanohybrids (CDs/Mg‐Al LDH)  is proposed as novel dual‐functional materials for paper protection against UV degradation and acidification. Through a CDs‐assisted in situ growth strategy, CDs/Mg‐Al LDH with ultrathin thickness (≈9.1 nm) and CDs‐intercalated structure are achieved. The CDs/Mg‐Al LDH nanohybrids demonstrate high dispersibility, strong UV absorption, and remarkable photostability, resulting in protected‐paper with decelerated acidification, oxidation, and yellowing degradation processes under both accelerated UV‐aging and dry‐heat conditions. Additionally, the protected‐paper can emit uniform blue light under 365 nm UV excitation allows for easy identification of the distributed CDs/Mg‐Al LDH within the paper, marking a unique and practical feature. This research paces a new direction for the protection of paper‐based relics with emerging carbon dots‐based 0D/2D nanomaterials.

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Carbon dots: building a robust optical shield for wood preservation

Cited by 30 publications

References 49 publications

Construction of composite films using carbon nanodots for blocking ultraviolet light from the Sun

Construction of composite films using carbon nanodots for blocking ultraviolet light from the Sun

Carbon Quantum Dots for Long-Term Protection against UV Degradation and Acidification in Paper-Based Relics

Efficient Protection of Paper‐Based Cultural Relics via In Situ Synthesis of Carbon Dots/Layered Double Hydroxide

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