User profiles for A.T. Charlie Johnson

at charlie Johnson

rebecca w bushnell professor of physics and astronomy, university of pennsylvania
Verified email at physics.upenn.edu
Cited by 30420

Intrinsic response of graphene vapor sensors

Y Dan, Y Lu, NJ Kybert, Z Luo, ATC Johnson - Nano letters, 2009 - ACS Publications
… ); the resist was exposed with a 30 keV electron beam at a dose of 500 μC/cm 2 and then …
current upon exposure to chemical vapors at varying concentration. At this point, the sample …

Scalable production of high-sensitivity, label-free DNA biosensors based on back-gated graphene field effect transistors

J Ping, R Vishnubhotla, A Vrudhula, ATC Johnson - ACS nano, 2016 - ACS Publications
… to control DNA with the mismatch at the center is strongly … The reason that a mismatch at
the center of the strand has … with two mismatches, one at the center and one at the 5′ end…

High‐on/off‐ratio graphene nanoconstriction field‐effect transistor

…, DR Strachan, JH Lim, Z Luo, ATC Johnson - Small, 2010 - Wiley Online Library
… ratio of 14 at room temperature. c) I–V g characteristics of the same device at various bias
voltages. d) Current-versus-bias characteristics for the same device at various gate voltages. …

Strong Exciton–Plasmon Coupling in MoS2 Coupled with Plasmonic Lattice

…, B Lee, CH Naylor, HS Ee, J Park, ATC Johnson… - Nano …, 2016 - ACS Publications
We demonstrate strong exciton–plasmon coupling in silver nanodisk arrays integrated with
monolayer MoS 2 via angle-resolved reflectance microscopy spectra of the coupled system. …

DNA translocation through graphene nanopores

…, MD Fischbein, K Venta, Z Luo, ATC Johnson… - Nano …, 2010 - ACS Publications
We report on DNA translocations through nanopores created in graphene membranes.
Devices consist of 1−5 nm thick graphene membranes with electron-beam sculpted nanopores …

High yield preparation of macroscopic graphene oxide membranes

…, Y Lu, LA Somers, ATC Johnson - Journal of the American …, 2009 - ACS Publications
Graphene oxide membranes up to 2000 μm 2 in size can be synthesized with 90% yield in
bulk quantities through a microwave-assisted chemical method. Membranes are readily …

Crystallographic etching of few-layer graphene

SS Datta, DR Strachan, SM Khamis, ATC Johnson - Nano letters, 2008 - ACS Publications
We demonstrate a method by which few-layer graphene samples can be etched along
crystallographic axes by thermally activated metallic nanoparticles. The technique results in long (…

Probing the structure of DNA− carbon nanotube hybrids with molecular dynamics

RR Johnson, ATC Johnson, ML Klein - Nano letters, 2008 - ACS Publications
… over the course of MD at a constant temperature of 330 K for 21 … 20 additional simulations
conducted at 300 K and involving 5 … Thus, the results of this simulation are relevant at room …

Raman Shifts in Electron-Irradiated Monolayer MoS2

…, CH Naylor, JA Rodríguez-Manzo, ATC Johnson… - ACS …, 2016 - ACS Publications
We report how the presence of electron-beam-induced sulfur vacancies affects first-order
Raman modes and correlate the effects with the evolution of the in situ transmission-electron …

Band Alignment and Minigaps in Monolayer MoS2-Graphene van der Waals Heterostructures

…, YJ Dappe, MG Silly, F Sirotti, ATC Johnson… - Nano …, 2016 - ACS Publications
… peak observed at 1.83 eV arises from the direct interband recombination at the K-point of
the Brillouin zone of the photogenerated electron–hole pairs; the weaker shoulder at about 2 …