School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
Langmuir. 2010 Jun 1;26(11):8497-502. doi: 10.1021/la904439p.
Biological systems such as proteins, viruses, and DNA have been most often reported to be used as templates for the synthesis of functional nanomaterials, but the properties of widely available biopolymers, such as cellulose, have been much less exploited for this purpose. Here, we report for the first time that cellulose nanocrystals (CNC) have the capacity to assist in the synthesis of metallic nanoparticle chains. A cationic surfactant, cetyltrimethylammonium bromide (CTAB), was critical to nanoparticle stabilization and CNC surface modification. Silver, gold, copper, and platinum nanoparticles were synthesized on CNCs, and the nanoparticle density and particle size were controlled by varying the concentration of CTAB, the pH of the salt solution, and the reduction time.
生物系统，如蛋白质、病毒和 DNA，通常被报道可作为合成功能纳米材料的模板，但广泛存在的生物聚合物（如纤维素）的性质在这方面的应用却要少得多。在这里，我们首次报道了纤维素纳米晶体（CNC）具有辅助合成金属纳米粒子链的能力。阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）对于纳米粒子的稳定和 CNC 表面改性至关重要。在 CNC 上合成了银、金、铜和铂纳米粒子，通过改变 CTAB 的浓度、盐溶液的 pH 值和还原时间来控制纳米粒子的密度和粒径。
