| AVS 59th Annual International Symposium and Exhibition | |
| Graphene and Related Materials Focus Topic | Wednesday Sessions |
| Session GR+AS+BI+PS+SS-WeM |
| Session: | Graphene Surface Chemistry, Functionalization, Biological and Sensor Applications |
| Presenter: | M.C. Hersam, Northwestern University |
| Correspondent: | Click to Email |
Graphene has emerged as one of the leading materials in condensed matter physics due to its superlative electrical and mechanical properties. With an eye towards expanding its functionality and applications, this talk will highlight our latest efforts to tailor the surface chemistry of graphene [1]. At the molecular scale, we employ ultra-high vacuum (UHV) scanning tunneling microscopy (STM) and conductive atomic force microscopy (cAFM) to characterize chemically modified epitaxial graphene on SiC(0001) [2,3]. For example, a suite of perylene-based molecules form highly ordered self-assembled monolayers (SAMs) on graphene via gas-phase deposition in UHV [4,5]. Due to their noncovalent bonding, these SAMs preserve the superlative electronic properties of the underlying graphene while providing uniform and tailorable chemical functionality [6]. In this manner, disparate materials (e.g., high-k gate dielectrics) can be seamlessly integrated with graphene, thus enabling the fabrication of capacitors, transistors, and related electronic/excitonic devices [7]. Alternatively, via aryl diazaonium chemistry, functional polymers can be covalently grafted to graphene [8], while exposure to atomic oxygen in UHV enables chemically homogeneous and thermally reversible covalent epoxy functionalization [9]. Beyond UHV STM characterization, this talk will also delineate our most recent efforts to exploit chemically modified graphene in technologically significant applications including photovoltaics [10], transparent conductors [11-13], flexible GHz transistors [14], in vivo biomedical applications [15,16], and photocatalysts [17].
[1] Q. H. Wang and M. C. Hersam, MRS Bull., 36, 532 (2011).
[2] J. A. Kellar et al., Appl. Phys. Lett., 96, 143103 (2010).
[3] J. M. P. Alaboson et al., Adv. Mater., 23, 2181 (2011).
[4] Q. H. Wang and M. C. Hersam, Nature Chemistry, 1, 206 (2009).
[5] Q. H. Wang and M. C. Hersam, Nano Lett., 11, 589 (2011).
[6] J. D. Emery et al., Surf. Sci., 605, 1685 (2011).
[7] J. M. P. Alaboson, et al., ACS Nano, 5, 5223 (2011).
[8] Md. Z. Hossain et al., J. Am. Chem. Soc., 132, 15399 (2010).
[9] Md. Z. Hossain et al., Nature Chemistry, 4, 305 (2012).
[10] I. P. Murray et al., J. Phys. Chem. Lett., 2, 3006 (2011).
[11] A. A. Green and M. C. Hersam, J. Phys. Chem. Lett., 1, 544 (2010).
[12] A. A. Green and M. C. Hersam, Nano Lett., 9, 4031 (2009).
[13] Y. T. Liang and M. C. Hersam, J. Am. Chem. Soc., 132, 17661 (2010).
[14] C. Sire et al., Nano Lett., 12, 1184 (2012).
[15] M. C. Duch et al., Nano Lett., 11, 5201 (2011).
[16] J.-W. T. Seo et al., J. Phys. Chem. Lett., 2, 1004 (2011).
[17] Y. T. Liang et al., Nano Lett., 11, 2865 (2011).