Tough, High stretched, Self‐healing C‐dots/Hydrophobically Associated Composited Hydrogels and Their Use for a Fluorescence Sensing Platform. Issue 21 (1st June 2018)

• Record Type: Journal Article
• Authors: Zhang, Yiyi; Wu, Meng; Chen, Jing; Zhou, Huan; Zhang, Yulin; Shi, Lingying; Ran, Rong
• Is Part Of: ChemistrySelect. Volume 3:Issue 21(2018)
• Page Start: 5756
• Page End: 5765
• Publication Date: 2018-06-01
• Subjects: Carbon dots -- Hydrophobically associated hydrogels -- Self-healing -- Mechanical properties -- Fluorescence sensor; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201800497
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: In this paper, about 3.5 nm spherical carbon nanodots (C‐dots) were prepared through simple hydrothermal method, then they were introduced into the hydrophobically associated (HA) hydrogels. A new class of double physically crosslinked hydrogels (HCD hydrogels) were successfully prepared. C‐dots act as physical crosslinker in HA physically cross‐linked PAM network, and the hydrogen bond interaction between C‐dots and PAM chains endows the hydrogel with extraordinarily mechanical, high stretched and self‐healing properties. Moreover, introduction of C‐dots gives HCD hydrogels excellent fluorescence properties and good photostability. The location of emision‐wavelength of HCD hydrogel was independent of excitation‐wavelength, while the fluorescence intensity depended on excitation‐wavelength, and increased linearly with the increased concentration of C‐dots. The sensing HCD hydrogel platform based upon ROS of detecting H2 O2 was also explored. ROS formed by decomposition of H2 O2 induced fluorescence quench of hydrogels. The fluorescence intensity ratio (I0 /I) of the H2 O2 ‐HCD at 550 nm correlated linearly with the concentration of H2 O2 in the range of 0.01‐25 μM. Impressively, this fluorescence sensor exhibited high sensitivity, simplicity, cost‐efficiency and broad applicability. Consequently our study demonstrates a general approach to prepare the robust and self‐healing hydrogels which have application potential in sensing fields. Abstract : In this paper, C‐dots were prepared through simple hydrothermal method, then C‐dots/hydrophobically associated composite hydrogels (HCD hydrogels) were successfully prepared by introducing C‐dots into the HA hydrogels. HCD hydrogels had extraordinarily mechanical, high stretched, self‐healing and excellent fluorescence properties and good photostability. The sensing HCD hydrogel platform based upon ROS of detecting H2 O2 was also explored. This fluorescence sensor exhibited high sensitivity, simplicity, cost‐efficiency and broad applicability.