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Nano-optoelectronic sensors and devices bring tremendous revolutions in photoelectric conversion due to dimension reduced. The device geometry dominates the electron transport so that the spatially resolved optoelectronics properties are critical to characterize device performance. In this paper, it reports a two-photon pulsed laser scanning microscopy method which utilizes raster scan on device with...
N-type doping of graphene with long-term air stability represents a significant challenge for practical application of graphene electronics. This paper reports a reversible doping method that uses SU-8 photoresist as a doping and encapsulating material to enable highly air-stable n-type semiconducting properties of graphene. The SU-8 resist simultaneously serves as an effective electron dopant, a...
This paper reports a simple and controllable post-synthesis method for engineering the number of graphene layers based on oxygen plasma etching. Singular sheet etching (SSE) of graphene was achieved with the optimum process duration of 38 seconds. As a demonstration of this SSE process, monolayer graphene films were produced from bilayer graphenes. Experimental investigations verified that the oxygen...
This paper reported a new application of graphene that is graphened thermistor. Mono-layer, bi-layer and few-layer graphene devices with different dimensions were designed and fabricated. Temperature sensing behavior of graphene has been studied in a small temperature range from room temperature (RT) to 80°C because this range is important in electronic instrumentations and integrated circuit design...
This paper reported a technique for tuning graphene semiconductor properties by introducing nanoholes into single- and few-layer graphene films. A simple nanofabrication technique has been demonstrated for making periodic nanoholes on pristine graphene in a mask-free and time-efficient manner via direct e-beam writing which was done by simply scanning the graphene area that is covered with EBL resist...
This paper reports simple fabrication approaches that can be used to generate a suspended graphene sheet with the desired thickness, while eliminating the need for a crytical point dryer. Two methods have been developed to achieve a large suspended area of graphenes. In the first approach, SF6 plasma was used to make holes or channels with specific dimensions. Then micromechanical exfoliation was...
We investigated the sensing abilities of pristine graphene based nanosensors in response to the attachment of Escherichia coli (E. coli) to the graphene surfaces. Using pristine graphenes, instead of functionalized graphenes, helps us understand better the influence of E. coli cells on the transport properties of graphenes. The biosensors based on pristine few-layer graphenes showed a discriminable...
Graphene-based nanosensors with inter-layer structures were built and tested as gas sensors in response to ethanol and water molecules, and were compared with intra-layer nanosensors built on mono-layer and bi-layer graphenes. Ethanol and water molecules were chosen because they act differently as donors and acceptors to graphenes. The results show that the sensitivities of the inter-layer graphene...
A simple and controllable method was developed to engineer the layer number of graphene based on oxygen plasma etching technique. With the optimum parameters, our so-called “one layer etching” process can be used to remove one single graphene layer at a time. As experimental demonstrations, mono-layer graphenes gotten from bi-layer graphenes and the one layer peeling of a few-layer graphene gotten...
This paper presents the design, fabrication, and characterization of a novel high-performance molecule sensor using the inter-sheet tunneling effect of a bilayer graphene. Nanosensors for ethanol molecules have been fabricated based on mechanical exfoliation and e-beam lithography for demonstrating the feasibility. Experiments reveled that by making electric contacts to different sheets of a bilayer...
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