Graphene NEMS switch for electrostatic discharge protection applications

Researches from the University of California, Riverside and University of California, Los Angeles have demonstrated a novel above-IC graphene NEMS switches for electrostatic discharge (ESD) protection applications.

Graphene NEMS switch for electrostatic discharge protection applications image

This graphene ESD switch is a two-terminal device with a gap between the conducting substrate at the bottom and a suspended graphene membrane on top serving as the discharging path. This new concept provides a potentially revolutionary mechanism for the on-chip ESD protections.

UCLA team designs a novel type of graphene-based photodetector

Engineers from the UCLA have Used graphene to design a new type of photodetector that can work with more types of light than its current state-of-the-art counterparts. The device also has superior sensing and imaging capabilities.

UCLA's novel graphene-based photodetector image

photodetectors' versatility and usefulness depend largely on three factors: their operating speed, their sensitivity to lower levels of light, and how much of the spectrum they can sense. Typically, when engineers have improved a photodetector’s capabilities in any one of those areas, at least one of the two other capabilities has been diminished. The photodetector designed by the UCLA team has major improvements in all three areas – it operates across a broad range of light, processes images more quickly and is more sensitive to low levels of light than current technology.

New tree-inspired electrodes could boost supercapacitors’ performance

Researchers from the UCLA, Mississippi State University, University of Nevada and China's Central South have designed an efficient and long-lasting graphene-based electrode for supercapacitors. The device’s design was inspired by the structure and function of leaves on tree branches, and it is said to be more than 10 times more efficient than other designs.

An efficient and long-lasting graphene-based electrode for supercapacitors image

The electrode design reportedly provides the same amount of energy storage, and delivers as much power as similar electrodes, despite being much smaller and lighter. In experiments it produced 30% better capacitance — a device’s ability to store an electric charge — for its mass compared to the best available electrode made from similar carbon materials, and 30 times better capacitance per area. It also produced 10 times more power than other designs and retained 95% of its initial capacitance after more than 10,000 charging cycles.

A graphene-based device reveals the dynamics of single-molecule reactions

A team of international researchers has made a graphene-based device that captures the real-time dynamics of a classic chemical reaction at the single molecule level. Developed at Peking University, UCLA and the Institute Chinese Academy of Sciences, the method could shed light on the mechanism of chemical and biological processes.

Graphene device reveals step-by-step dynamics of single-molecule reaction image

The device consists of two graphene arrays that flank a single molecule covalently tied to each array through amide linkers. The molecule, 9-fluorenone, contains a carbonyl group situated astride three fused rings. The team submerged the device in a solution containing a catalyst and the reagent hydroxylamine, which reacts with 9-fluorenone’s carbonyl group. The reaction changes the electrical charge of 9-fluorenone, so the team could follow the nucleophilic addition reaction by monitoring current conducted by the graphene arrays.

Graphene-based biological supercapacitors may enable improved pacemakers and implantable medical devices

Researchers from UCLA and the University of Connecticut have designed a biological supercapacitor which operates using ions derived from bodily fluids. The team predicts that this work could lead to longer-lasting cardiac pacemakers and other implantable medical devices.

The biosupercapacitor, which features graphene layered with modified human proteins as an electrode, could be used in next-generation implantable devices to speed bone growth, promote healing or stimulate the brain.