Northeastern University

Massachusetts Institute of Technology

William Marsh Rice University

Korea Research Institute of Chemical Technology

Hyun Young Jung

Yung Joon Jung

Swastik Kar

Pulickel Madhavapanicker Ajayan

Mildred S Dresselhaus

Ji Hao

Sung-Goo Lee

Bo Li

Youngjae Yoo

Chi Won Ahn

Sanghyun Hong

Paulo Antonio Trindade Araujo

Inter-allotropic transformations of carbon are provided using moderate conditions including alternating voltage pulses and modest temperature elevation. By controlling the pulse magnitude, small-diameter single-walled carbon nanotubes are transformed into larger-diameter single-walled carbon nanotubes, multi-walled carbon nanotubes of different morphologies, and multi-layered graphene nanoribbons.

Fabrication of carbon nanoribbons from carbon nanotube arrays

An ion detection device has a strip of carbon-based nanomaterial (CNM) film and a chamber enclosing the CNM film. A low bias voltage is applied at the ends of the CNM film strip, and ions present in the chamber are detected by a change in the magnitude of current flowing through the CNM film under the bias. Also provided are methods for fabricating the device, methods for measuring pressure of a gas, and methods for monitoring or quantifying an ionizing radiation using the device.

Ultrasensitive ion detector using carbon nanotubes or graphene

Mechanically flexible and optically transparent thin film solid state supercapacitors are fabricated by assembling nano-engineered carbon electrodes in porous templates. The electrodes have textured graphitic surface films with a morphology of interconnected arrays of complex shapes and porosity. The graphitic films act as both electrode and current collector, and when integrated with solid polymer electrolyte function as thin film supercapacitors. The nanostructured electrode morphology and conformal electrolyte packaging provide enough energy and power density for electronic devices in addition to possessing excellent mechanical flexibility and optical transparency.

Flexible and transparent supercapacitors and fabrication using thin film carbon electrodes with controlled morphologies

A simple, economical method of producing nanowire arrays is described. The method produces high density arrays having nanowires with diameters below 10 nm and does not require templating, catalysts, or surface pre/post-treatment. The disclosed methods and systems can be used, for example, for optoelectronic devices and photovoltaic cells, Li-ion batteries, chemical/bio sensors and transistors.

Methods of preparing high density aligned silicon nanowire

Growing community of inventors

Malden, MA, United States of America

Hyun Young Jung