Highly Photoluminescent Carbon Dots for Multicolor Patterning, Sensors, and Bioimaging

Zhu, Shoujun; Meng, Qingnan; Wang, Lei; Zhang, Junhu; Song, Yubin; Jin, Han; Zhang, Kai; Sun, Hongchen; Li, Ang; Yang, Bai

doi:10.1002/ange.201300519

Cited by 831 publications

(514 citation statements)

References 51 publications

Supporting

Mentioning

490

Contrasting

Unclassified

Order By: Relevance

“…Zhu and his co-workers found that the photoluminescence intensity of hydrothermally synthesized CDs decreased dramatically only after 9 minutes of illumination with 2000 W ultraviolet (UV) exposure. 17 The differences in the photostability of CDs come obviously from varying structures due to different synthetic routes. The term CDs includes carbon dots synthesized using topdown and bottom-up methods, i.e.…”

Section: Introductionmentioning

confidence: 99%

Photobleaching and stabilization of carbon nanodots produced by solvothermal synthesis

Wang

Damm

Walter

et al. 2016

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

In this work we performed a detailed investigation of the photostability of bottom-up produced carbon nanodots (CDs) prepared from citric acid and urea by solvothermal synthesis. Analytical ultracentrifugation (AUC) reveals that the CDs have a hydrodynamic diameter of o1 nm and a very narrow size distribution.In the community it is widely assumed that CDs are photo-stable. In contrast, we found that CDs exposed to UV-irradiation exhibit noteworthy fluorescence degeneration compared to freshly prepared CDs or CDs stored in the dark, indicating that fluorescence bleaching is caused by a photochemical process. We found that fluorescence intensity decay due to exposure to UV-irradiation is accelerated in the presence of oxygen and identified the surface status of CDs as the decisive factor of fluorescence bleaching of CDs.Based on a discussion on the underlying mechanisms we show how to avoid photobleaching of CDs.

show abstract

Section: Introductionmentioning

confidence: 99%

Photobleaching and stabilization of carbon nanodots produced by solvothermal synthesis

Wang

Damm

Walter

et al. 2016

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8] Especially, CDs, owing to their superior performance in terms of water solubility, stability, toxicity, resistance to photobleaching, and biocompatibility, have recently drawn significant attention. [9][10][11][12][13][14][15] The electron injection from CDs to TiO 2 was demonstrated to be feasible and the CD-sensitized TiO 2 photoelectrodes have been applied in photocatalysis and PVs. 10,[16][17][18][19][20][21] However, it is still a challenge to achieve efficient electron injection from CDs to TiO 2 under sunlight, 21 which is a primary photophysical process in generating photocurrent in CD-based PVs.…”

Section: Introductionmentioning

confidence: 99%

“…23,[26][27][28] In addition, the reported CDs are generally passivated with insulating long chain molecules, 10,12,29 which act as tunneling barriers and are against efficient electron injection and well performing CD-based optoelectronic devices. 22,30 To realize efficient CD-sensitized TiO 2 PVs under sunlight, the CDs should exhibit intrinsic absorption in the visible region and be integrated effectively with TiO 2 . Thus, it is of significant interest to exploit such photoelectrodes based on CD/TiO 2 composites to demonstrate the possibility of developing a well performing CD-based PV system.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Towards efficient photoinduced charge separation in carbon nanodots and TiO₂ composites in the visible region

Sun

et al. 2015

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

Towards efficient photoinduced charge separation in carbon nanodots and TiO2 composites in the visible region Sun, M.; Qu, S.; Ji, W.; Jing, P.; Li, D.; Qin, L.; Cao, J.; Zhang, H.; Zhao, J.; Shen, D. General rights It is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. In this work, photoinduced charge separation behaviors in non-long-chain-molecule-functionalized carbon nanodots (CDs) with visible intrinsic absorption (CDs-V) and TiO 2 composites were investigated. Efficient photoinduced electron injection from CDs-V to TiO 2 with a rate of 8.8 Â 10 8 s À1 and efficiency of 91% was achieved in the CDs-V/TiO 2 composites. The CDs-V/TiO 2 composites exhibited excellent photocatalytic activity under visible light irradiation, superior to pure TiO 2 and the CDs with the main absorption band in the ultraviolet region and TiO 2 composites, which indicated that visible photoinduced electrons and holes in such CDs-V/TiO 2 composites could be effectively separated. The incident photon-to-current conversion efficiency (IPCE) results for the CD-sensitized TiO 2 solar cells also agreed with efficient photoinduced charge separation between CDs-V and the TiO 2 electrode in the visible range. These results demonstrate that non-long-chainmolecule-functionlized CDs with a visible intrinsic absorption band could be appropriate candidates for photosensitizers and offer a new possibility for the development of a well performing CD-based photovoltaic system.

show abstract

“…All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. Carbon dots (CDs), having unique optical property, high aqueous solubility, excellent biocompatibility, low toxicity, and robust chemical inertness, [1][2][3][4][5] have been widely studied and applied in various fields including bio-imaging, 6 catalysis, 7,8 light-emitting diodes, 9,10 sensors, 6,11 as well as solar cells. [12][13][14] Since CDs were discovered by Xu et al in 2004, 15 tremendous research efforts have focused on developing synthetic approaches which can be classified as "up-down" and "bottom-up" methods.…”

mentioning

confidence: 99%

Fluorescently tuned nitrogen-doped carbon dots from carbon source with different content of carboxyl groups

et al. 2015

View full text Add to dashboard Cite

In this study, fluorescent nitrogen-doped carbon dots (NCDs) were tuned via varying the sources with different number of carboxyl groups. Owing to the interaction between amino and carboxyl, more amino groups conjugate the surface of the NCDs by the source with more carboxyl groups. Fluorescent NCDs were tuned via varying the sources with different content of carboxyl groups. Correspondingly, the nitrogen content, fluorescence quantum yields and lifetime of NCDs increases with the content of carboxyl groups from the source. Furthermore, cytotoxicity assay and cell imaging test indicate that the resultant NCDs possess low cytotoxicity and excellent biocompatibility.

show abstract

Highly Photoluminescent Carbon Dots for Multicolor Patterning, Sensors, and Bioimaging

Cited by 831 publications

References 51 publications

Photobleaching and stabilization of carbon nanodots produced by solvothermal synthesis

Photobleaching and stabilization of carbon nanodots produced by solvothermal synthesis

Towards efficient photoinduced charge separation in carbon nanodots and TiO₂ composites in the visible region

Fluorescently tuned nitrogen-doped carbon dots from carbon source with different content of carboxyl groups

Contact Info

Product

Resources

About