Journal article

Publication year: 2013

Pages: 9790-9797

Journal: Langmuir

Volume number: 29

Issue number: 31

ISSN: 0743-7463

DOI Link: https://doi.org/10.1021/la401781e

Publisher: American Chemical Society

Abstract: 

Diamondoids (nanometer-sized diamond-like hydrocarbons) are a novel
class of carbon nanomaterials that exhibit negative electron affinity
(NEA) and strong electron–phonon scattering. Surface-bound diamondoid
monolayers exhibit monochromatic photoemission, a unique property that
makes them ideal electron sources for electron-beam lithography and
high-resolution electron microscopy. However, these applications are
limited by the stability of the chemical bonding of diamondoids on
surfaces. Here we demonstrate the stable covalent attachment of
diamantane phosphonic dichloride on tungsten/tungsten oxide surfaces.
X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared
(FTIR) spectroscopy revealed that diamondoid-functionalized tungsten
oxide films were stable up to 300–350 °C, a substantial improvement over
conventional diamondoid thiolate monolayers on gold, which dissociate
at 100–200 °C. Extreme ultraviolet (EUV) light stimulated photoemission
from these diamondoid phosphonate monolayers exhibited a characteristic
monochromatic NEA peak with 0.2 eV full width at half-maximum (fwhm) at
room temperature, showing that the unique monochromatization property of
diamondoids remained intact after attachment. Our results demonstrate
that phosphonic dichloride functionality is a promising approach for
forming stable diamondoid monolayers for elevated temperature and
high-current applications such as electron emission and coatings in
micro/nano electromechanical systems (MEMS/NEMS).

Harvard Citation style: Li, F., Fabbri, J., Yurchenko, R., Mileshkin, A., Hohman, J., Yan, H., et al. (2013) Covalent Attachment of Diamondoid Phosphonic Acid Dichlorides to Tungsten Oxide Surfaces, Langmuir, 29(31), pp. 9790-9797. https://doi.org/10.1021/la401781e

APA Citation style: Li, F., Fabbri, J., Yurchenko, R., Mileshkin, A., Hohman, J., Yan, H., Yuan, H., Tran, I., Willey, T., Bagge-Hansen, M., Dahl, J., Carlson, R., Fokin, A., Schreiner, P., Shen, Z., & Melosh, N. (2013). Covalent Attachment of Diamondoid Phosphonic Acid Dichlorides to Tungsten Oxide Surfaces. Langmuir. 29(31), 9790-9797. https://doi.org/10.1021/la401781e