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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE · 2020 ·Vol. 646 ·期 19 ·1655-1659 · IF 1.24

Graphene Oxide/Carbon Nanocoil Composite for High-performance Humidity Sensor

Luyu Wang,Jinguli Wen,Yuhang Wu,Junkuo Gao

Designing a humidity sensor with high performance to quick and accurate detect relative humidity (RH) is important in various applications. Consideration must be given to both the high response and the quick reversibility. Here, based on Quartz Crystal Microbalance (QCM) sensing platform, we utilized commercial graphene oxide as a sensing material, and added commercial carbon nanocoil to block the stacking of graphene oxide layers. The fabricated novel sensor possessed super high response (4618 Hz/97 % RH) and quick reversibility (2 s). This work not only expands the application of commercial carbon materials, but also achieves the development of high-performance humidity sensor with commercial potential.

CAS / MDL: 7782-42-5

研究领域: 材料科学 · 传感器技术

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ACS Applied Materials & Interfaces · 2018 · IF 8.097

Superfast and Reversible Thermoresponse of Poly(N-isopropylacrylamide) Hydrogels Grafted on Macroporous Poly(vinyl alcohol) Formaldehyde Sponges

Yanxiong Pan,Bingrui Li,Zhi Liu,Zhongyu Yang,Xu Yang,Kai Shi,Wei Li,Chao Peng,Weicai Wang,Xiangling Ji

Poly(N-isopropylacrylamide) (PNIPAAm), a typical thermoresponsive polymer, exhibits potential application in smart materials. However, bulk PNIPAAm hydrogel monoliths undergo slow volume phase transition at least tens of minutes to hours as determined by the shape and size of polymers due to the formation of the skin layer. In this regard, novel macroporous sponges with rapid thermoresponse are prepared via grafting polymerization of N-isopropylacrylamide (NIPAAm) onto the macroporous poly(vinyl alcohol) formaldehyde (PVF) network as confirmed by attenuated total reflection-infrared (ATR IR) and 1H NMR spectra. As prepared PVF-g-PNIPAAm sponges display interconnected open-cell structures, and their average pore sizes and porosities are ∼90 μm and >85%, respectively. The equilibrium swelling ratio of PVF-g-PNIPAAm sponges varies from 11 to 50 with temperature. The volume phase transition temperature is at 30–34 °C, as detected in the DSC curves of swollen samples. These features indicate that the existence of the original PVF network exerts almost no influence on the PNIPAAm temperature responsibility. As prepared samples can reach the swelling equilibrium in less than 80 s, and their rapid swelling kinetics can be fitted using the pseudo-first-order rate kinetic equation. Notably, the samples also display rapid deswelling rate in less than 40 s at relative high temperature (48 °C), thereby indicating a superfast responsive behavior to temperature change. The PVF-g-PNIPAAm sponges exhibit rapid and reversible thermoresponse in repeatable swelling–deswelling cycles, which can satisfy the need of special smart materials. In particular, combined with iodine solution (i.e., PVF-g-PNIPAAm/I2), these sponges can serve as a novel temperature indicator and exhibit excellent antibacterial performances.

CAS / MDL: 16774-21-3 7727-54-0 2210-25-5 110-26-9 110-18-9 9002-93-1

研究领域: 材料科学 · 高分子化学 · 生物医学工程

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Graphene Oxide/Carbon Nanocoil Composite for High-performance Humidity Sensor

Superfast and Reversible Thermoresponse of Poly(N-isopropylacrylamide) Hydrogels Grafted on Macroporous Poly(vinyl alcohol) Formaldehyde Sponges