MS18-P06 1-Dimensional sp3-Carbon Nanostructures Synthesized through Nanocasting at High Pressure One-dimensional diamond mesostructures (1D-diamond) are of interest as heat-conducting wires, and as mechanically reinforcing material in diamond/polymer composites because of the superlative mechanical strength and thermal conductivity of diamond. Thus far, 1D-diamond has been produced by CVD methods.1 However, CVD methods do not allow for the economic production of bulk quantities of 1D-diamond, and it is difficult to control the diameters and length of the produced 1D-diamond structures. Currently there is no high-pressure synthesis available for the bulk synthesis of one-dimensional diamond mesostructures. The basic problem is that at high-pressure conditions it is difficult to direct the growth of diamond crystals in a specific direction. In addition, any one-dimensional structure formed can easily aggregate with another which prevents any further processing after the high-pressure synthesis.2
Herein, we present the synthesis of diamond-like 1D sp3-carbon mesostructures from benzene inside the 1-dimensional channels of periodic mesoporous silica SBA-15 at pressures above 20 GPa and room temperature (Figure 1). Inside the silica template, the 1D-sp3-carbon nanostructures are spatially separated from each other preventing their aggregation at the high-pressure conditions. Small Angle and X-Ray Scattering data collected for SBA-15/benzene composite clearly shows that silica mesostructure retains its periodic order upon compression, while X-ray diffraction experiments allow to track pressure-induced structural transformations of benzene.
Acknowledgements: This work was supported by the EFree, an Energy Frontier Research Center of the US Department of Energy Office of Basic Energy Science (SC-0001057).
 Schwander, M., Partes, K. (2011) Diamond and Rel. Mater. 20, 1287-1301.
 Yu, Y., Wu, L., Zhi, J. (2014) Angew. Chem. Int. Ed. 53, 2-28.Keywords: one-dimensional nanomaterials, high pressure, diamond anvil cell