▎ 摘　　要

In this study, a graphene oxide (GO)-based thermoresponsive smart catalytic material with a phase-transition temperature of approximately 37 degrees C was developed by growing poly(N-isopropylacrylamide) (PNIPAM) on GO sheets (i.e., GO-PNIPAM). The composite was characterized by Fourier transform infrared spectroscopy, N-2 adsorption, thermogravimetric analysis, organic elemental analysis, differential scanning calorimetry, and X-ray photoelectron spectroscopy. GO-PNIPAM-supported Ru catalysts (i.e., Ru/GO-PNIPAM) were then prepared for cinnamaldehyde (CAL) hydrogenation. The influence of thermosensitive smart surface on the reaction was investigated. Results indicated that GO-PNIPAM exhibited the hydrophilic surface at 25 degrees C, which resulted in highly dispersed Ru nanoparticles on the composite. Afterward, the surface wettability of Ru catalyst was spontaneously changed to hydrophobicity at 70 degrees C that greatly improved CAL sorption on the catalyst in the reaction. The synergistic effect between Ru and GO-PNIPAM as well as the great adsorption ability to reactants on Ru/GO-PNIPAM jointly resulted in the enhancement of catalytic activity over it in comparison to that over GO-supported Ru catalyst (Ru/GO). Meanwhile, the hydrophobic surface of Ru/GO-PNIPAM at a high-temperature preferred C=0 adsorption mode, yielding a higher cinnamyl alcohol selectivity than Ru/GO did.