Patterning of graphene oxide with optoelectronic tweezers

Abstract

Optoelectronic tweezers (OET) offer a means for parallel trapping and dynamic manipulation of micro-scale particles using low-intensity light. Such capabilities can facilitate the formation of bulk materials with a precisely tailored microstructure. Here, we report the use of OET to vertically align, trap, and reposition sheets of graphene oxide (GO) in liquids, paving the way for textured and patterned graphene macroassemblies that could offer superior performance for applications in energy storage, catalysis, and electronic devices. Trapping can be achieved with low-power light from inexpensive digital projectors and diode lasers, making it simple for users to create and apply patterns while avoiding undesirable photothermal heating effects. To give users a quantitative idea of trap stiffness, we also present a theoretical framework for predicting the maximum achievable speed of a GO platelet in an OET trap.

Assembly of Topographical Micropatterns with Optoelectronic Tweezers

“…In recognition of these limitations, a second category of "dry" cleanroom-free methods has been developed, including 3D printing, [8][9][10] laser machining, [11] and "pick-and-place" technologies. [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] The new method is a member of the wet cleanroom-free assembly techniques, but lacks many of the limitations indicated previously. [22][23][24][25] These techniques, in which patterns of 3D particles are assembled in a fluidic environment and are later dried for use in TMP applications, are creative and interesting, and preserve many of the advantages of the canonical methods while allowing for accessible, cleanroom-free operation.…”

“…[26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] The new method is a member of the wet cleanroom-free assembly techniques, but lacks many of the limitations indicated previously. [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] The new method is a member of the wet cleanroom-free assembly techniques, but lacks many of the limitations indicated previously.…”

A Review on Optoelectrokinetics-Based Manipulation and Fabrication of Micro/Nanomaterials

“…OEK has also been used to dynamically manipulate nano-scaled entities, including the separation of nanowires [64][65][66][67], the patterning of two-dimensional nanomaterials [68], and manipulation of nanoparticles [69][70][71][72][73][74].…”

Graphene-based spinmechatronic valve

“…Recent experimental work showed the possibility to modify the RTA in-situ with an atomic force microscope tip [28], however the transition speed is slow for plausible applications. Other alternative is to use optical nano-tweezers to trap a graphene layer and twisted with respect to substrate, recently graphene trapping is achieved at the microscale using optoelectronic tweezer [40]. With the fast developing research of nano-optical tweezer by trapping and rotating nanostructures [41,42], the possibility to control RTA of multi layer graphene at the nanoscale should be within the reach in the few next years.…”