23October2019

Nano-Micro Letters

Super-strong and Intrinsically Fluorescent Silkworm Silk from Carbon Nanodots Feeding

Suna Fan1, Xiaoting Zheng1, Qi Zhan1, Huihui Zhang1, Huili Shao1, Jiexin Wang2, Chengbo Cao3, 4 ,*, Meifang Zhu1, Dan Wang2, *, Yaopeng Zhang1, *

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Nano-Micro Lett. (2019) 11: 75

First Online: 11 September 2019 (Article)

DOI:10.1007/s40820-019-0303-z

*Corresponding author. E-mail: zyp@dhu.edu.cn (Yaopeng Zhang); wangdan@mail.buct.edu.cn (Dan Wang); cbcao@sdu.edu.cn (Chengbo Cao)

 

Abstract

 


Toc

Fluorescent silk is fundamentally important for the development of future tissue engineering scaffolds. Despite great progress in the preparation of a variety of colored silks, fluorescent silk with enhanced mechanical properties has yet to be explored. In this study we report on the fabrication of intrinsically super-strong fluorescent silk by feeding Bombyx mori silkworm carbon nanodots (CNDs). The CNDs were incorporated into silk fibroin, hindering the conformation transformation, confining crystallization, and inducing orientation of mesophase. The resultant silk exhibited super-strong mechanical properties with breaking strength of 521.9 ± 82.7 MPa and breaking elongation of 19.2 ± 4.3%, improvements of 55.1% and 53.6%, respectively, in comparison with regular silk. The CNDs reinforced silk displayed intrinsic blue fluorescence when exposed to 405 nm laser and exhibited no cytotoxic effect on cells, suggesting that multi-functional silks would be potentially useful in bioimaging and other applications.


 

Keywords

Silkworm silk; Carbon nanodot; Mechanical property; Fluorescent silk; Feeding method

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