User profiles for A.T. Charlie Johnson
at charlie Johnsonrebecca 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
… ); 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 …
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…
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. …
voltages. d) Current-versus-bias characteristics for the same device at various gate voltages. …
Strong Exciton–Plasmon Coupling in MoS2 Coupled with Plasmonic Lattice
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. …
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 …
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 …
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 (…
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 …
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 …
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
… 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 …
the Brillouin zone of the photogenerated electron–hole pairs; the weaker shoulder at about 2 …