石墨烯携载无机纳米粒子的制备及拉曼性能研究

通过原位复合的方法,在石墨烯片层间掺杂纳米银颗粒,制备出石墨烯/银纳米杂化材料(RGO/Ag)。利用紫外吸收光谱、傅里叶红外光谱、透射电子显微镜(TEM)、XRD、拉曼光谱等对氧化石墨烯(GO)、还原氧化石墨烯(RGO)和石墨烯/银纳米杂化材料(RGO/Ag)进行表征。发现复合材料中的银对石墨烯/银材料有拉曼增强作用,结合TEM对这种增强作用进行研究,发现银颗粒的团聚对这种增强作用有减弱作用。     

纳米粒子/氧化石墨烯改性复合膜制备及其分离性能研究

采用真空抽滤-压力喷涂的方法，以聚酰胺纳滤膜为基膜，制备了氧化石墨烯和二氧化钛纳米粒子质量比为1∶1、2∶1、3∶1和4∶1的复合膜GOT1、GOT2、GOT3和GOT4以及氧化石墨烯和二氧化硅纳米粒子质量比为1∶1、2∶1、3∶1和4∶1的复合膜GOS1、GOS2、GOS3和GOS4。通过SEM、EDS、XPS和GIWAXS方法对GOT复合膜和GOS复合膜进行了分析表征，结果表明，氧化石墨烯和纳米粒子均匀负载在聚酰胺纳滤膜表面。研究了复合膜的性能，并推测了复合膜的净水机理。其中GOT复合膜在0.75 MPa下水通量可达50 L·m^-2·h^-1,相较于原始基膜提高了25%,显示出了最佳的水通量性能，并且在保持较高通量的同时，对盐溶液和重金属离子的截留率仍能维持在90%左右。真空抽滤-压力喷涂的方法为氧化石墨烯复合膜的制备提供一种新的工艺思路，为废水处理提供了一种更高净化效率的复合膜。     

有机-无机杂化抗菌微滤膜的制备及性能研究

采用氨基硅烷偶联剂对氧化石墨烯（GO）进行改性,通过吸附、还原法负载纳米银,制得载银改性氧化石墨烯（Ag@ mGO）,然后将其与聚乙烯醇（PVA）共混,经非溶剂致相分离（NIPS）法制得有机-无机杂化微滤膜（M1～M5）。对Ag@ mGO及M1～M5进行了FTIR、XRD、TEM、SEM、接触角、孔隙率及平均孔径等结构表征,同时也对M1～M5的抗菌性能、过滤性能及耐污染性能进行了测试。结果表明,Ag @mGO粒径在10 nm以下,载银摩尔分数为5.45%;M1～M5的接触角最小可达23.3°,孔隙率（ε）为30%~40%,平均孔径 (rm)为0.54~0.71μm,具有较好的亲水性和优异的过滤性能。同时,M1～M5对牛血清蛋白（BSA）的截留率（R）在80.2 %以上,对大肠杆菌(K12)的抑菌圈直径在1.29 cm以上,说明制备的杂化微滤膜M2～M5具有良好的耐BSA污染和抗菌性能。     

氧化石墨烯与纳米氧化铁复合物的制备及性能研究

文章用Hummers法制备氧化石墨,以绿矾为原料、采用氯酸钠氧化制备纳米氧化铁,采用超声共混,搅拌,烘干制的复合物,通过FT-IR/TG/TEM等进行表征,结果表明,氧化石墨完全剥落,氧化铁在内分散很好,两者界面相容很好。复合材料吸附性好,有很好吸附砷的功能。     

银-石墨烯复合材料的原位制备及性能研究

以鳞片石墨为原料,采用Hummers法制备氧化石墨.氧化石墨与硝酸银溶液混合超声处理,通过功能离子预吸附的方式,将银离子有效地分散在氧化石墨烯载体上.以水合肼为还原剂,同时还原氧化石墨和硝酸银溶液中的银离子,原位制备银-石墨烯复合材料.采用X射线衍射仪、扫描电子显微镜对制得的银-石墨烯复合材料进行表征,并对复合材料的电化学性能进行分析.结果显示,制得银-石墨烯复合材料的比电容明显高于单纯的石墨烯材料,电化学性质优异,是理想的电化学电容器电极材料.     

拉曼光谱在石墨烯结构表征中的应用研究

作为一种常见的二维原子晶体结构,石墨烯是在sP2碳原子紧密堆积下而产生的,其结构与性质非常独特,引发科学界极大关注。本文将具体分析石墨烯结构表征通过使用拉曼光谱技术而取得的一些进展,探究典型拉曼光谱特征,并对石墨烯堆垛与掺杂效应对拉曼特征的影响深入讨论,以为相关研究提供一些借鉴。     

石墨烯纳米复合材料的制备及性能研究

以泡沫镍为模板、石墨为催化剂、酚醛树脂为碳源,采用水热法以及热处理方法制备了三维石墨烯复合材料,再利用化学沉积法制备三维氧化镍-石墨烯-泡沫镍复合材料,并对其结构和电性能进行了分析,研究结果表明,该复合材料的石墨化程度高,具备电极特性,电化学性能稳定。     

石墨烯载钴材料的制备

本实验以150μm鳞片状石墨为原料,采用Hummers法制备氧化石墨,经超声波振荡得到氧化石墨烯,加入水合肼回流制得石墨烯材料.氧化石墨烯与CoSO4溶液混合,采用功能离子预吸附的方式,将金属离子有效地分散在氧化石墨烯载体上,原位还原金属颗粒和石墨烯,制备石墨烯载钴材料.     

无机纳米杂化聚酰亚胺薄膜的制备及性能研究

以聚酰胺酸作为基体，通过正硅酸乙酯（TEOS）和异丙醇铝发生水解缩合反应，然后与聚酰胺酸发生溶胶凝胶过程，从而制备出无机纳米掺杂聚酰亚胺薄膜。利用傅里叶红外光谱、热失质量、介电谱及击穿试验对其热性能和电性能进行表征和测试，考察了相应的结构与性能之间的关系。     

催化剂制备与研究 石墨烯/聚苯胺复合材料的制备及其光催化性能

以苯胺和氧化石墨烯溶液为原料,采用乳液聚合法,根据m(氧化石墨烯)∶m(苯胺)为0∶10、1∶20和1∶10合成不同石墨烯/聚苯胺复合材料。采用紫外可见分光光度计、SEM、XRD及FT-IR对复合材料进行表征。XDR和FT-IR表明,乳液聚合合成了石墨烯/聚苯胺复合材料。SEM表明,聚苯胺以氧化石墨烯为载体,分散在其表面。光催化结果表明,石墨烯/聚苯胺复合材料的光催化性能较纯聚苯胺明显提高,m(氧化石墨烯)∶m(苯胺)=1∶20的石墨烯/聚苯胺复合材料的光催化性能高于m(氧化石墨烯)∶m(苯胺)=1∶10,原因可能在于微观结构的不同。     

Preparation of graphene/carbon hybrid nanofibers and their performance for NO oxidation

A series of novel microdomain-graphitized polyacrylonitrile (PAN)-based nanofibers were prepared by adding varied amounts of graphene oxide into the precursor via the electrospinning method. These hybrid electrospun nanofibers with were stabilized in ambient atmosphere, carbonized in nitrogen atmosphere and treated in NH₃ atmosphere for NO oxidation with low concentration (50 ppm) at room temperature. The samples were characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, and nitrogen adsorption at 77 K. Oxidation of NO into NO₂ at room temperature was investigated in a fiber fixed-bed. The results demonstrated that the reduced graphene oxide sheets provide catalytic active sites embedded in the PAN-based nanofibers. In addition it was determined that nitrogen-containing functional groups played important roles in the enhancement of the catalytic oxidation of NO to NO₂. The samples with 5 wt.% GO exhibit the most catalytic oxidation of NO into NO₂.     

Design and synthesis of NiCo2O4/NiCoO2/graphene hybrid nanoarrays with enhanced capacitive performance

NiCo₂O₄/NiCoO₂/graphene hybrid nanoarrays on Ni foam have been designed and synthesized through a hydrothermal method and post-annealing treatment. Highly conductive graphene sheets were embedded into or coated onto the NiCo₂O₄/NiCoO₂ arrays, which strongly affect influence the morphology and electrochemical performance of hybrid nanoarrays. Under the effect of graphene, the architecture of the NiCo₂O₄/NiCoO₂ consists of cluster-like arrays that are self-assembled from numerous nanoneedles and provides more electroactive sites for the redox reaction. However, without the assistance of graphene, the pure NiCo₂O₄/NiCoO₂ exhibits the morphology of flake-like arrays on the Ni foam. The NiCo₂O₄/NiCoO₂/graphene arrays show an ultrahigh capacity of 1439 C g^-1 at a current density of 1 mA cm^-2, which is far larger than that of the pure NiCo₂O₄/NiCoO₂ flake-arrays (695 C g^-1). Furthermore, even at a high current density of 60 mA cm^-2, the NiCo₂O₄/NiCoO₂/graphene arrays maintain a high gravimetric capacity of 1172 C g^-1 (capacity retention: 81.4%), which indicates an excellent rate capability. Further, the hybrid capacitor shows a maximum energy density of 34.3 Wh kg^-1. The present study suggests that the NiCo₂O₄/NiCoO₂/graphene hybrid arrays have great application potential as a positive electrode for hybrid supercapacitors.     

One‐step synthesis of graphene nanoplatelets/SiO2 hybrid materials with excellent toughening performance

Graphene nanoplatelets (GNPs)/SiO₂ hybrid materials had been prepared successfully via chemical grafting in one step. Herein, SiO₂ particles and GNPs were connected by poly acryloyl chloride (PACl). The results from Fourier transform infrared spectroscopy showed that functionalized GNPs and SiO₂ particles had been successfully bridged with chemical bonds like O CO and Si O C. And the nanostructure of hybrid materials was characterized by scanning electron microscopy and transmission electron microscopy. All the images indicated that SiO₂ particles were grafted on the surface of GNPs successfully. Moreover, the result of Raman spectroscopy showed that carbon atoms of GNPs became much more disorder, due to destroying the carbon domains during the process of chemical drafting. Meaningfully, the results from tensile tests indicated that Graphene/SiO₂ hybrid materials had better toughening effect on epoxy composites than graphene oxide and SiO₂ particles. POLYM. COMPOS., 36:907–912, 2015. © 2014 Society of Plastics Engineers     

PS/POE/功能化石墨烯纳米复合材料的制备和性能研究

利用马来酸酐接枝聚烯烃(POE-g-MAH)弹性体为增韧剂,乙二胺功能化石墨烯(G-EDA)为纳米填料,经熔融共混法制备了聚苯乙烯(PS)/POE-g-MAH/G-EDA纳米复合材料,并对填料和所得纳米复合材料的结构和性能进行了全面的表征。红外光谱(FTIR)、扫描电子显微镜(SEM)、力学性能、维卡软化温度和熔融指数测试表明:乙二胺(EDA)已成功接枝于石墨烯的表面上;共混过程中,POE-g-MAH的酐基与EDA的氨基发生反应改善了共混体系的界面相容性;G-EDA在熔融共混过程中均匀分散于PS基体中;随着G-EDA含量的增加,复合材料的拉伸强度先增大后降低,当G-EDA质量分数为0.5%时,复合材料的拉伸强度达到最大值,比PS/POE-g-MAH提高了12.3%,比纯PS提高了15.5%;而当G-EDA质量分数为0.75%时,复合材料的冲击强度达到最大值,比PS/POE-g-MAH提高了22%,比纯PS提高了22.4%。因此,当G-EDA的质量分数在0.5%~0.75%之间时,复合材料的综合力学性能最好。G-EDA的加入,纳米复合材料的邵氏A硬度、维卡软化温度等都逐渐增大,而熔融指数逐渐降低。     

Carbon nanotube/graphene composite for enhanced capacitive deionization performance

In this study, single-walled carbon nanotubes were combined with graphene oxide nanosheets in aqueous dispersion and then chemically reduced to form the carbon nanotube/graphene (CNT/G) composite as electrodes for capacitive deionization (CDI). The structure of the CNT/G composite was highly porous, with single-walled carbon nanotubes (SWCNTs) sandwiched between graphene sheets that functioned as spacers and provided diffusion paths for smooth and rapid ion conduction. The associated increase in the electrical double-layer capacitance enhanced capacitive deionization performance. The CNT/G composite achieved a specific capacitance of 220 F/g and an electrosorption capacity of 26.42 mg/g with 100% regeneration, showing great potential as a high performance electrode material in CDI applications.     

硅/石墨烯基自支撑薄膜的制备及电化学性能

采用简单的超声、抽滤和水合肼化学还原相结合的方法制备硅/石墨烯基自支撑薄膜,系统研究了硅含量对硅/石墨烯复合材料电化学性能的影响。结果表明：通过在石墨烯水凝胶的片层之间插入纳米硅颗粒,可以有效地控制硅体积变化,增加该复合膜的机械强度并提高其导电性。提高硅/石墨烯复合材料中硅含量的比例可以提升其可逆比容量和首次库仑效率,当硅质量分数为53%时,复合膜在0.1C倍率下的可逆比容量及首次库仑效率分别达到945.6mA·h/g和64.8%（纯硅的229倍和9倍）;继续提高硅含量的比例,可以提升其循环寿命（循环50次容量保持率60.9%、质量分数为67%的Si）,但材料比容量有所下降,说明石墨烯在稳定硅基复合材料电化学性能方面发挥着非常重要作用。     

石墨烯的制备及石墨烯/PVDF合材料介电性能的研究

通过Staudenmaier法制备了完全氧化的氧化石墨(GO),并通过高温热膨胀制备了单层石墨烯(graphene).用FT-IR、TG和XRD对GO的氧化程度、含氧官能团进行了表征;Graphene的XRD测试结果证明了单层石墨的存在.利用超声共混法制备了graphene/PV DF介电纳米复合材料.介电性能的测试表...