Effects of copper, nickel, and its alloy as catalysts for graphene growth via chemical vapor deposition method: a review

Enormous characteristics exhibited by two-dimensional carbon-based nanomaterial, graphene attract current researchers in integrating this advanced material into the development of next-generation electronic, optoelectronic, photonic, and photovoltaic devices. The ultimate aim was to synthesis a single layer of graphene with large-size domain with less defect formation. The solid state of the graphene promises ultra-high performance in the devices due to ultra-high electron mobility. Within a decade, previous researchers have narrowed down their studies by applying different types of metal species as catalyst substrate in chemical vapor deposition method. The crucial part was to determine the characteristics of carbon precipitation and diffusion onto the metal surfaces. Each metal-based catalyst and its alloy revealed different behavior according to its carbon solubility and intrinsic properties. Until now, copper, nickel, and its alloy combination provide tremendous finding in the synthetization of graphene. Currently, researchers are still exploring the ideal parameters related to feeding gases, growth temperatures, and working pressures which are essential to each catalyst metals characteristic such as copper, nickel, and its alloy

Synthesis of zeolite templated graphene (ZTG) from methanol via chemical vapor deposition (CVD) method

A new synthesis route in the production of graphene by template synthesis technique using zeolite as the host materials has successfully produced graphene. The highly regular ordered and highly crystalline structure of zeolite was successfully utilized for the formation of ordered sp2 graphitized graphene structure in the zeolite porous framework. Graphitic carbon structure of zeolite template graphene (ZTG) has been synthesized via catalytic chemical vapor deposition (CVD) method from methanol as the carbon precursor. The influence factors of types of zeolite used in the template synthesis and CVD reaction temperatures have been investigated to obtain the optimum experimental condition for producing high quality of ZTG. The results show acid sites of the zeolite plays an important role in the synthesis of ZTG in porous framework of zeolite structure. CVD reaction temperatures at 500°C is considered as the best reaction temperature for the production of graphene using zeolite as template with high quality of carbon graphitic structure. UV- Visible spectroscopy and Raman spectroscopy analysis further proven the existence of sp2 character of graphene structure with small amount of defect in the ZTG produced

Structural modification of pristine graphene network towards nanoporous graphene membrane: a review

A single graphene layer is superior many ways preferably in electronic devices application. However, mild modification of the graphene network could open a new potential to the ultrathin graphene membrane. Moreover, recent studies demonstrated that a few simple techniques could generate and control the nanopores size on single layer graphene sheet simultaneously. This review paper will discuss all potential techniques that are capable to generate nanopores structure on the pristine single layer graphene network

Triblock copolymer-controlled crystallization of ZnO nanorod-microspheres from aqueous solution

ZnO microspheres were hydrothermally synthesized using triblock copolymer Pluronic F127 as a crystal growth modifier. The ZnO microspheres were composed of nanorods assemblies. The ZnO nanorods with a diameter of less than 100nm were radially grown from the center in all directions. A possible growth mechanism is that ZnO seed species were stabilized in hydrophilic chains of Pluronic F127 micelles and that ZnO nanorods radially grew in the c direction from a center due to the effect of steric hindrance