Mark Hersam Professor of Materials Science and Engineering; Professor of Chemistry; Bette and Neison Harris Chair in Teaching Excellence; Director, Materials Research Science and Engineering (MRSEC)

Research Interests

The Hersam Research Group specializes in the processing, characterization, and application of nanoelectronic materials including graphene, carbon nanotubes, and silicon.  Of specific interest are strategies for producing monodisperse nanomaterials and organically/biologically functionalizing semiconductor surfaces.  Experimental techniques range from atomic-resolution ultra-high vacuum scanning tunneling microscopy to macroscopic charge transport and optical property measurements.  A wide range of applications are being explored including integrated circuits, optoelectronic devices, biosensors, drug delivery, photovoltaics, catalysis, and batteries.

Selected Publications

V. K. Sangwan, D. Jariwala, I. S. Kim, K.-S. Chen, T. J. Marks, L. J. Lauhon, and M. C. Hersam, “Gate-tunable memristive phenomena mediated by grain boundaries in single-layer MoS2,” Nature Nanotechnology, 10, 403 (2015).

D. Jariwala, V. K. Sangwan, J.-W. T. Seo, W. Xu, J. Smith, C. H. Kim, L. J. Lauhon, T. J. Marks, and M. C. Hersam, “Large-area, low-voltage, antiambipolar heterojunctions from solution-processed semiconductors,” Nano Letters, 15, 416 (2015).

J. D. Wood, S. A. Wells, D. Jariwala, K.-S. Chen, E. Cho, V. K. Sangwan, X. Liu, L. J. Lauhon, T. J. Marks, and M. C. Hersam, “Effective passivation of exfoliated black phosphorus transistors against ambient degradation,” Nano Letters, 14, 6964 (2014).

J. Kang, J.-W. T. Seo, D. Alducin, A. Ponce, M. J. Yacaman, and M. C. Hersam, “Thickness sorting of two-dimensional transition metal dichalcogenides via copolymer-assisted density gradient ultracentrifugation,” Nature Communications, 5, 5478 (2014).

M. Gong, T. A. Shastry, Y. Xie, M. Bernardi, D. Jasion, K. A. Luck, T. J. Marks, J. C. Grossman, S. Ren, and M. C. Hersam, “Polychiral semiconducting carbon nanotube-fullerene solar cells,” Nano Letters, 14, 5308 (2014).

E. B. Secor, S. Lim, H. Zhang, C. D. Frisbie, L. F. Francis, and M. C. Hersam, “Gravure printing of graphene for large-area flexible electronics,” Advanced Materials, 26, 4533 (2014).

T. A. Shastry, A. J. Morris-Cohen, E. A. Weiss, and M. C. Hersam, “Probing carbon nanotube-surfactant interactions with two-dimensional DOSY NMR,” J. Am. Chem. Soc., 135, 6750 (2013).

E. A. Pozzi, M. D. Sonntag, N. Jiang, J. M. Klingsporn, M. C. Hersam, and R. P. Van Duyne, “Tip-enhanced Raman imaging: An emergent tool for probing biology at the nanoscale,” ACS Nano, 7, 885 (2013).

J. Huang, A. L. Ng, Y. Piao, C.-F. Chen, A. A. Green, C.-F. Sun, M. C. Hersam, C. S. Lee, and Y. Wang, “Covalently functionalized double-walled carbon nanotubes combine high sensitivity and selectivity in the electrical detection of small molecules,” J. Am. Chem. Soc., 135, 2306 (2013).

A. Behnam, V. K. Sangwan, X. Zhong, F. Lian, D. Estrada, D. Jariwala, A. J. Hoag, L. J. Lauhon, T. J. Marks, M. C. Hersam, and E. Pop, “High-field transport and thermal reliability of sorted carbon nanotube network devices,” ACS Nano, 7, 482 (2013).

T. A. Shastry, J.-W. T. Seo, J. J. Lopez, H. N. Arnold, J. Z. Kelter, V. K. Sangwan, L. J. Lauhon, T. J. Marks, and M. C. Hersam, “Large-area, electronically monodisperse, aligned single-walled carbon nanotube thin films fabricated by evaporation-driven self-assembly,” Small, 9, 45 (2013).

D. A. Bonnell, J. M. Buriak, W. C. W. Chan, J. H. Hafner, P. T. Hammond, M. C. Hersam, A. Javey, N. A. Kotov, A. E. Nel, P. J. Nordlander, R. M. Penner, A. L. Rogach, R. E. Schaak, M. M. Stevens, A. T. S. Wee, C. G. Willson, and P. S. Weiss, “We take it personally,” ACS Nano, 6, 10417 (2012).

A. Deshpande, C.-H. Sham, J. M. P. Alaboson, J. M. Mullin, G. C. Schatz, and M. C. Hersam, “Self-assembly and photopolymerization of sub-2 nm one-dimensional organic nanostructures on graphene,” J. Am. Chem. Soc., 134, 16759 (2012).

V. K. Sangwan, R. P. Ortiz, J. M. P. Alaboson, J. D. Emery, M. J. Bedzyk, L. J. Lauhon, T. J. Marks, and M. C. Hersam, “Fundamental performance limits of carbon nanotube thin-film transistors achieved using hybrid molecular dielectrics,” ACS Nano, 6, 7480 (2012).

M. Engel, M. Steiner, R. S. Sundaram, R. Krupke, A. A. Green, M. C. Hersam, and Ph. Avouris, “Spatially resolved electrostatic potential and photocurrent generation in carbon nanotube array devices,” ACS Nano, 6, 7303 (2012).

G. N. Ostojic and M. C. Hersam, “Biomolecule-directed assembly of self-supported, nanoporous, conductive, and luminescent single-walled carbon nanotube scaffolds,” Small, 8, 1840 (2012).

Md. Z. Hossain, J. E. Johns, K. H. Bevan, H. J. Karmel, Y. T. Liang, S. Yoshimoto, K. Mukai, T. Koitaya, J. Yoshinobu, M. Kawai, A. M. Lear, L. L. Kesmodel, S. L. Tait,and M. C. Hersam, "Chemically homogeneous and thermally reversible oxidation of epitaxial graphene," Nature Chemistry, 4, 305 (2012).

A. Deshpande, C.-H. Sham, J. M. P. Alaboson, J. M. Mullin, G. C. Schatz, and M. C. Hersam, "Self-assembly and photopolymerization of sub-2 nm one-dimensional organic nanostructures on graphene," Journal of the American Chemical Society, 134, 16759 (2012).

V. K. Sangwan, R. P. Ortiz, J. M. P. Alaboson, J. D. Emery, M. J. Bedzyk, L. J. Lauhon, T. J. Marks, and M. C. Hersam, "Fundamental performance limits of carbon nanotube thin-film transistors achieved using hybrid molecular dielectrics," ACS Nano, 6, 7480 (2012).

A. A. Green and M. C. Hersam, "Nearly single-chirality single-walled carbon nanotubes produced via orthogonal iterative density gradient ultracentrifugation," Advanced Materials, 23, 2185 (2011).

Q. H. Wang and M. C. Hersam, "Nanofabrication of heteromolecular organic nanostructures on epitaxial graphene via room temperature feedback-controlled lithography," Nano Letters, 11, 589 (2011).

A. A. Green and M. C. Hersam, “Processing and properties of highly enriched double-wall carbon nanotubes,” Nature Nanotechnology4, 64 (2009).

Q. H. Wang and M. C. Hersam, “Room-temperature molecular-resolution characterization of self-assembled organic monolayers on epitaxial graphene,”Nature Chemistry1, 206 (2009).

M. C. Hersam, “Progress towards monodisperse single-walled carbon nanotubes,”Nature Nanotechnology3, 387 (2008).