我们做过，直接采用不同的镍盐前驱体、浸渍在二氧化硅上、700度焙烧后，就可以得到4-40纳米的镍颗粒。如果焙烧温度低、可能更小。欢迎参考：Journal of Catalysis, Volume 250, Issue 2, 10 September 2007, Pages 331-341（有详细的制备步骤和表征方法）如果可以添加助剂，如La2O3, ZrO2, 或者Ce-Zr, 那么有可能在二氧化硅表面制备更小的颗粒。可以参考：Catalysis Today, Volume 131, Issues 1–4, 29 February 2008, Pages 278-284Fuel, Volume 87, Issue 7, June 2008, Pages 1348-1354International Journal of Hydrogen Energy, Volume 33, Issue 20, October 2008, Pages 5493-5500International Journal of Hydrogen Energy, Volume 34, Issue 9, May 2009, Pages 3734-3742，
