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https://hdl.handle.net/2440/100850
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Type: | Journal article |
Title: | Proton-functionalized two-dimensional graphitic carbon nitride nanosheet: an excellent metal-/label-free biosensing platform |
Author: | Ma, T. Tang, Y. Dai, S. Qiao, S. |
Citation: | Small, 2014; 10(12):2382-2389 |
Publisher: | Wiley |
Issue Date: | 2014 |
ISSN: | 1613-6810 1613-6829 |
Statement of Responsibility: | Tian Yi Ma, Youhong Tang, Sheng Dai, and Shi Zhang Qiao |
Abstract: | Ultrathin graphitic carbon nitride (g-C₃N₄) nanosheets, due to their interesting two-dimensional graphene-like structure and unique physicochemical properties, have attracted great research attention recently. Here, a new approach is developed to prepare, for the first time, proton-functionalized ultrathin g-C₃N₄ nanosheets by sonication-exfoliation of bulk g-C₃N₄ under an acid condition. This method not only reduces the exfoliation time from more than 10 h to 2 h, but also endows the nanosheets with positive charges. Besides retaining the properties of g-C₃N₄, the obtained nanosheets with the thickness of 2-4 nm (i.e., 6-12 atomic monolayers) also exhibit large specific surface area of 305 m² g⁻¹, enhanced fluorescence intensity, and excellent water dispersion stability due to their surface protonation and ultrathin morphology. The well-dispersed protonated g-C₃N₄ nanosheets are able to interact with negatively charged heparin, which results in the quenching of g-C₃N₄ fluorescence. A highly sensitive and highly selective heparin sensing platform based on protonated g-C₃N₄ nanosheets is established. This metal-free and fluorophore label-free system can reach the lowest heparin detection limit of 18 ng mL⁻¹. |
Keywords: | Carbon nitride; nanosheets; heparin; biosensing; fluorescence |
Rights: | © 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim |
DOI: | 10.1002/smll.201303827 |
Grant ID: | http://purl.org/au-research/grants/arc/DP140104062 http://purl.org/au-research/grants/arc/DP130104459 http://purl.org/au-research/grants/arc/DP110102877 |
Published version: | http://dx.doi.org/10.1002/smll.201303827 |
Appears in Collections: | Aurora harvest 3 Chemical Engineering publications |
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