Mark C. Hersam

Michael J Bedzyk25
Tobin J Marks13
Jonathan D Emery12
Jeffrey W Elam6
25Michael J Bedzyk
13Tobin J Marks
12Jonathan D Emery
6Jeffrey W Elam
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Femtosecond two-pulse degenerate four-wave mixing spectroscopy was applied to study the exciton dephasing in a broad range of excitation intensities and lattice temperatures. We find that both exciton-exciton and exciton-phonon scattering have profound effects on the dephasing process. The dominant phonon mode involved in the dephasing is identified as the(More)
Ubiquitous low-frequency 1/f noise can be a limiting factor in the performance and application of nanoscale devices. Here, we quantitatively investigate low-frequency electronic noise in single-layer transition metal dichalcogenide MoS2 field-effect transistors. The measured 1/f noise can be explained by an empirical formulation of mobility fluctuations(More)
With an eye toward using surface morphology to enhance heterogeneous catalysis, Pt nanoparticles are grown by atomic layer deposition (ALD) on the surfaces of SrTiO(3) nanocubes. The size, dispersion, and chemical state of the Pt nanoparticles are controlled by the number of ALD growth cycles. The SrTiO(3) nanocubes average 60 nm on a side with {001} faces.(More)
Direct conversion of light into mechanical work, known as the photomechanical effect, is an emerging field of research, largely driven by the development of novel molecular and polymeric material systems. However, the fundamental impediment is that the previously explored materials and structures do not simultaneously offer fast and wavelength-selective(More)
  • Vinod K Sangwan, Rocio Ponce Ortiz, Justice M P Alaboson, Jonathan D Emery, Michael J Bedzyk, Lincoln J Lauhon +2 others
  • 2012
In the past decade, semiconducting carbon nanotube thin films have been recognized as contending materials for wide-ranging applications in electronics, energy, and sensing. In particular, improvements in large-area flexible electronics have been achieved through independent advances in postgrowth processing to resolve metallic versus semiconducting carbon(More)
  • Jonathan D Emery, Qing Hua Wang, Marie Zarrouati, Paul Fenter, Mark C Hersam, Michael J Bedzyk +1 other
  • 2011
a r t i c l e i n f o Epitaxial graphene, grown by thermal decomposition of the SiC (0001) surface, is a promising material for future applications due to its unique and superlative electronic properties. However, the innate chemical passivity of graphene presents challenges for integration with other materials for device applications. Here, we present(More)
  • Justice M P Alaboson, Qing Hua Wang, Jonathan D Emery, Albert L Lipson, Michael J Bedzyk, Jeffrey W Elam +2 others
  • 2011
The development of high-performance graphene-based nanoelectronics requires the integration of ultrathin and pinhole-free high-k dielectric films with graphene at the wafer scale. Here, we demonstrate that self-assembled monolayers of perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) act as effective organic seeding layers for atomic layer deposition(More)
  • Maogang Gong, Tejas A Shastry, Yu Xie, Marco Bernardi, Daniel Jasion, Kyle A Luck +4 others
  • 2014
Single-walled carbon nanotubes (SWCNTs) have highly desirable attributes for solution-processable thin-film photovoltaics (TFPVs), such as broadband absorption, high carrier mobility, and environmental stability. However, previous TFPVs incorporating photoactive SWCNTs have utilized architectures that have limited current, voltage, and ultimately power(More)
  • Justice M P Alaboson, Chun-Hong Sham, Sumit Kewalramani, Jonathan D Emery, James E Johns, Aparna Deshpande +5 others
  • 2013
Molecular-scale control over the integration of disparate materials on graphene is a critical step in the development of graphene-based electronics and sensors. Here, we report that self-assembled monolayers of 10,12-pentacosadiynoic acid (PCDA) on epitaxial graphene can be used to template the reaction and directed growth of atomic layer deposited (ALD)(More)
Atomic-layer 2D crystals have unique properties that can be significantly modified through interaction with an underlying support. For epitaxial graphene on SiC(0001), the interface strongly influences the electronic properties of the overlaying graphene. We demonstrate a novel combination of x-ray scattering and spectroscopy for studying the complexities(More)