【摘要】 通过层层自组装法将氧化石墨烯沉积在TEMPO氧化纳米纤维素薄膜表面,制备了纳米纤维素/氧化石墨烯(CNFs/[GO]_n)复合薄膜,最后经抗坏血酸还原得到纳米纤维素/还原氧化石墨烯(CNFs/[RGO]_n)透明导电复合薄膜,并对其性能进行了表征。透光率检测显示,CNFs薄膜经过组装GO并还原成CNFs/[RGO]_n复合薄膜后仍具有良好的透光性。原子力学显微镜检测结果显示,CNFs/[RGO]_n复合薄膜粗糙度增加,还原氧化石墨烯(RGO)纳米片层均匀地分布在CNFs薄膜表面。傅里叶红外光谱图、拉曼光谱和X射线光电子能谱仪分析证实了GO被成功地沉积到CNFs薄膜表面,且被抗坏血酸还原成RGO。四探针电导率测试仪测试显示,随着层层自组装循环次数的增加,CNFs/[RGO]_n杂化薄膜的电导率逐渐增大,当自组装循环次数为25次时,电导率达到最大值0.782 S/cm。应力-应变测试表明,随着层层自组装循环次数的增加,CNFs/[RGO]_n薄膜的机械强度有所降低,但当自组装循环次数为25次时,最大应力仍高达80 MPa左右。通过该方法制备的柔性透明导电薄膜可广泛用于柔性透明显示器、超级电容器和可穿戴柔性电子器件等产品的制备。更多还原

【Abstract】 In this study,cellulose nanofibrils( CNFs) was isolated from bamboo powder by the combination of 2,2,6,6-tetramethylpiperidin-1-oxyl radical( TEMPO) catalytic oxidation and ultrasonic treatment,and then was filtrated to manufacture CNFs films. Subsequently,graphene oxide( GO) was deposited on the surface of CNFs films using Cu2+ as cross-linking agent through the layer-by-layer self-assembly method,then the GO on the surface of the CNFs films was reduced to the reduced grahene oxide( RGO) with ascorbic acid to synthesis CNFs/[RGO]_n composite films. The results of the UV-Vis spectrophotometer testing indicated that the light transmittance of the CNFs/[RGO]_n composite films was about 81.6% between 400 and 800 nm,which still showed a good optical transparency. The results of atomic force microscope observation indicated that the RGO nanosheets were evenly distributed on the surface of the CNFs films,and the roughness of the CNFs/[RGO]_n composite film was larger than that of the pure CNFs films. The results of Fourier transform infrared spectroscopy detection showed that the characteristic intensity of C=O,C=C and C—OH stretching vibration of the GO decreased significantly after subjection to the reduction treatment.The Raman spectroscopy analysis indicated that the intensity of D peak increased obviously after the GO was reduced,and the value of ID( intensity if D peak)/IG( intensity of G peak) increased from 0.914 to 1.302. The X-ray photoelectron spectroscopy analysis showed that the intensity of CO,C=O peaks located at 288.34 eV and 289.66 eV were decreased,and the atomic ratio of carbon to oxygen after the reduction was significantly reduced. These detections confirmed that the GO on the surface of the CNFs films was fully reduced to the RGO. The four-probe conductivity tester detection showed that the conductivity of CNFs/[RGO]n composite films increased with the increase of self-assembly layers. When the self-assembly layer reached 25 times,the conductivity of CNFs/[RGO]25 composite films was around 0.782 S/cm. The stress-strain testing showed that the stress of the CNFs/[RGO]n films decreased with the decrease of self-assembly layers,and the stress of CNFs/[RGO]n reached around 80 MPa when the self-assembly layer was 25 times. Through this way,the CNFs/[RGO]n composite films were flexible,transparent and conductive,which could be widely used in the fabrication of flexible supercapacitors,wearable electronic devices,solar cell,tc.更多还原