Sol-gel process is my confident field to prepare new functionable glasses. Rare earth-doped glasses, proton-conducting glasses, nanoparticles-doped glasses, and self-assembling of metal nanoparticles have been developed. Splat quenching process of the melt is also good technique to obtain new glasses.



For detail, please refer next summary and page of research career.

New glasses exhibiting extremely high gas permeability were prepared from alumino-silicate system.

＜Papers＞

• Hydrogen Gas Permeation Through Al₂O₃–SiO₂ Glasses Containing Metal Ions

  M. Nogami, K Watanabe, Y. Ito, H. Ito
  J. Am. Ceram. Soc. 93, 1663~1667 (2010).

• Hydrogen Gas Reaction with Eu³⁺-Doped Al₂O₃–SiO₂ Glasses 

  M. Nogami, H. Shiiba, G. A. Kleine,
  J. Am. Ceram. Soc. 93, 3752~3756 (2010).

Spectral hole-burning glasses

The sol-gel method was for the first time applied to prepare the spectral hole-burning glasses. The mechanism for hole formation was also discussed.

＜Papers＞

• Room temperature persistent spectra hole burning in Sm²⁺-doped silicate glasses prepared by the sol-gel process

  M.Nogami, Y.Abe, K.Hirao, D.H.Cho
  Appl. Phys. Lett. 66, 2952~2954 (1995).

• Persistent spectral hole burning of sol-gel-derived Eu3+-doped SiO2 glass

  M. Nogami, T. Hayakawa
  Phys. Rev. B 56, R14235~14238 (1997).

• Persistent spectral hole burning in Eu3+-doped silicate glasses codoping Al3+ and P5+ ions

  M. Nogami, T. Nagakura, T. Hayakawa T. Sakai
  Chem. Mater. 10, 3991~3995 (1998).

• Room-temperature persistent spectral hole burning of Eu3+ coupling with Al3+ in glass

  M. Nogami, T. Ishikawa
  Phys. Rev., B, 63, 104205-1~6 (2001).

• New Hole-Burning Observations in Eu3+-Ion-Doped Glasses

  M. Nogami, G. Kawamura, L. Dapvril, K. Goto
  Adv. Mater. 19, 2347~2350 (2007).

Glasses with optical nonlinearities

Glasses exhibiting second and third nonlinearities or enhanced-emission intensity were successfully prepared using the sol-gel method.

＜Papers＞

• Laser induced SnO₂ crystallization and fluorescence properties in Eu³⁺doped-SnO₂-SiO₂ glasses

M. Nogami, A. Ohno, H. You
Phys. Rev. B, 68, 104204/1~104204/7 (2003).

• White light emission from radical carbonyl-terminations in Al2O3-SiO2 porous glasses with high　luminescence quantum efficiencies

T. Hayakawa, A. Hiramitsu, M. Nogami
Appl. Phys. Lett. 82, 2975~2977 (2003).

• Three-photon-excited fluorescence of Al2O3-SiO2 glass containing Eu3+ ions by femtosecond laser irradiation

H. You, M. Nogami
Appl. Phys. Lett., 84, 2076~2078 (2004).

• Blue light emission from Eu2+ ions in sol–gel-derived Al2O3–SiO2 glasses

Y. Kishimoto, X. Zhang, T. Hayakawa, M. Nogami
J. Lumin. 129, 1055~1059 (2009).

We have succeeded to prepare glasses with high proton conductivity compared with that of Nafion membrane and to apply them to hydrogen-oxygen fuel cell.

＜Papers＞

• Evidence of water-cooperative proton conduction in silica glass

  M. Nogami, Y Abe
  Phys. Rev. B, 18, 12108~12112 (1997).

• A sol-gel-derived glass as a fuel cell electrolyte

  M. Nogami, H. Matsushita, Y. Goto, T. Kasuga
  Adv. Mater. 12, 1370-1372 (2000).

• Dynamics of Proton Transfer in the Sol-Gel-Derived P2O5-SiO2 Glasses

  M. Nogami, Y. Daiko, T. Akai, T. Kasuga
  J. Phys. Chem. B, 105, 4653~4656 (2001).

• Proton conduction and pore structure in sol-gel glasses

  Y. Daiko, T. Kasuga, M. Nogami,
  Chem. Mater. 17, 4624-4627 (2002).

• Structural and Transport Properties of Mixed Phosphotungstic Acid/Phosphomolybdic Acid/SiO2 Glass Membranes for H2/O2 Fuel Cells

  T. Uma, M. Nogami
  Chem. Mater. 19, 3604~3610 (2007).

Size and shape-controlled metal nanoparticles of Au, Ag, Cu, Pt, Pd, Rh were prepaed using chemical process. The optical and catalytic properties have been discussed.

＜Papers＞

• Enhancement of third-order optical nonlinearities in 3-dimensional films of dielectric shell capped Au composite nanoparticles

  Y. Yang, M. Nogami, J. Shi, H. Chen, G. Ma, S. Tang
  J. Phys. Chem. B, 109, 4865~71 (2005).

• Controlled surface-plasmon coupling in SiO2-coated gold nanochains for tunable nonlinear optical properties

  Y. Yang, M. Nogami, J. Shi, H. Chen, G. Ma, S. Tang
  Appl. Phys. Lett. 88, 081110/1~081110/3 (2006)

• Self-Assembled Silver Nanochains for Surface-Enhanced Raman Scattering

  Y. Yang, J. Shi, T. Tanaka, M. Nogami
  Langmuir, 23, 12042~12047 (2007).

• Facile assembling of gold nanorods with large aspect ratio and their surface-enhanced Raman scattering properties

  G. Kawamura, Y. Yang, M. Nogami
  Appl. Phys. Lett. 90, 261908-1~-3 (2007).

• Solvothermal Synthesis of Multiple Shapes of Silver Nanoparticles and Their SERS Properties

  Y.Yang, S. Matsubara, L. Xiong, T. Hayakawa, M. Nogami
  J. Phys. Chem. C, 111, 9095~9104 (2007).

• Synthesis of Porous Single-Crystalline Platinum Nanocubes Composed of Nanoparticles

  M. Nogami, R. Koike, R. Jalem, G. Kawamura,.Y. Yang, Y. Sasaki
  J. Phys. Chem. Lett. 1, 568~571 (2010).

Silica glass was prepared by heating the gel synthesized from metal alkoxide at around 800oC. Glasses with new composition such as ZrO₂ (or Al₂O₃)-SiO₂ binary system were also prepared  using the sol-gel process.

＜Papers＞

• Glass formation through hydrolysis of Si(OC₂H_５)_４ with NH_４OH and HCl solution

  M.Nogami, Y.Moriya
  J. Non-cryst. Solids, 37, 191~201 (1980).

• Glass preparation of the ZrO₂-SiO₂ system by the sol-gel process from metal alkoxides

  M.Nogami
  J. Non-cryst. Solids, 69, 415~423 (1984).

• Sol-gel preparation of SiO₂ glasses containing Al₂O₃ or ZrO₂

  M.Nogami
  J. Non-cryst. Solids 178, 320~326 (1994). 

• Facile One-Step Synthesis of Highly Ordered Bimodal Mesoporous Phosphosilicate Monoliths

  L. Xiong, J. Shi, L. Zhang, M. Nogami
  J. Am. Chem. Soc. 129, 11878~11879 (2007).