Department of Chemistry, Nankai University, Tianjin, 300071 China.
Chemistry. 2010 Jul 19;16(27):8108-16. doi: 10.1002/chem.201000096.
A novel, facile, and general one-pot strategy is explored for the synthesis of diverse noble-metal (Au, Pt, Ag, or Pt/Au)/Fe(2)O(3) hybrid nanoparticles with the assistance of lysine (which is a nontoxic, user friendly amino acid that is compatible with organisms) and without using any other functionalization reagents. Control experiments show that lysine, which contains both amino and carboxylic groups, plays dual and crucial roles as both linker and capping agents in attaching noble metals with a small size and uniform distribution onto an Fe(2)O(3) support. Considering the perfect compatibility of lysine with organism, this approach may find potentials in biochemistry and biological applications. Furthermore, this novel route is also an attractive alternative and supplement to the current methods using a silane coupling agent or polyelectrolyte for preparing hybrid nanomaterials. To demonstrate the usage of such hybrid nanomaterials, a chemical gas sensor has been fabricated from the as-synthesized Au/Fe(2)O(3) nanoparticles and investigated for ethanol detection. Results show that the hybrid sensor exhibits significantly improved sensor performances in terms of high sensitivity, low detection limit, better selectivity, and good reproducibility in comparison with pristine Fe(2)O(3). Most importantly, this general approach can be further employed to fabricate other hybrid nanomaterials based on different support materials.
一种新颖、简便、通用的一锅法策略被探索用于合成各种贵金属（金、铂、银或铂/金）/Fe2O3 杂化纳米粒子，该方法在赖氨酸（一种无毒、使用方便的氨基酸，与生物体相容）的辅助下进行，无需使用任何其他功能化试剂。对照实验表明，赖氨酸同时含有氨基和羧基，在将小尺寸且均匀分布的贵金属连接到 Fe2O3 载体上时，发挥着双重且关键的作用，既是连接剂又是封端剂。考虑到赖氨酸与生物体的完美兼容性，这种方法可能在生物化学和生物应用中具有潜力。此外，这种新方法也是使用硅烷偶联剂或聚电解质制备杂化纳米材料的当前方法的有吸引力的替代和补充。为了展示这种杂化纳米材料的用途，我们使用所合成的 Au/Fe2O3 纳米粒子制备了一种化学气体传感器，并研究了其对乙醇的检测性能。结果表明，与原始的 Fe2O3 相比，该杂化传感器在灵敏度、检测限、选择性和良好的重现性方面表现出显著改善的传感器性能。最重要的是，这种通用方法可以进一步用于制造基于不同载体材料的其他杂化纳米材料。
