BIBLIOGRAPHY 44 of the fast blue luminescence of oxidized silicon nanocrystals: the role of the core. Nanoscale , 6(7):3837–3845. Park, J., Gu, L., von Maltzahn, G., Ruoslahti, E., Bhatia, S., and Sailor, M. (2009). Biodegradable luminescent porous silicon nanoparticles for in vivo applications. Nature Mat. , 8(4):331–336. Park, N., Kim, T., and Park, S. (2001). Band gap engineering of amorphous silicon quantum dots for light-emitting diodes. Appl. Phys. Lett. , 78:2575. Pavesi, L. (2003). Will silicon be the photonic material of the third millenium? J. Phys. C , 15:1169. Pavesi, L., Negro, L. D., Mazzoleni, C., Franz` o, G., and Priolo, F. (2000). Optical gain in silicon nanocrystals. Nature , 408:440–444. Peng, F., Su, Y., Zhong, Y., Fan, C., Lee, S.-T., and He, Y. (2014). Silicon nanomaterials platform for bioimaging, biosensing, and cancer therapy. Acc. Chem. Res. , 47(2):612–623. Pratontep, S., Carroll, S. J., Xirouchaki, C., Streun, M., and Palmer, R. E. (2005). Size-selected cluster beam source based on radio frequency magnetron plasma sputtering and gas condensation. Rev. Sci. Instr. , 76:045103. Priolo, F., Gregorkiewicz, T., Galli, M., and Krauss, T. F. (2014). Silicon nanos- tructures for photonics and photovoltaics. Nature Nanotechnology , 9(1):19–32. Raghavachari, K. (1986). Theoretical study of small silicon clusters: equilibrium geometries and electronic structures of Si$_{n}$ (n= 2–7, 10). J. Chem. Phys. , 84(10):5672–5686. Raghavachari, K. and Logovinsky, V. (1985). Structure and bonding in small silicon clusters. Phys. Rev. Lett. , 55(26):2853.