Yuan Shuai, Ge Fengyan, Zhou Man, Cai Zaisheng, Guang Shanyi
College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 201620, Shanghai, People's Republic of China.
Key Laboratory of Textile Science & Technology, Ministry of Education, Donghua University, Shanghai, People's Republic of China.
Nanoscale Res Lett. 2017 Aug 14;12(1):490. doi: 10.1186/s11671-017-2257-8.
A novel pH-responsive Ag@polyacryloyl hydrazide (Ag@PAH) nanoparticle for the first time as a surface-enhanced Raman scattering (SERS) substrate was prepared without reducing agent and end-capping reagent. Ag@PAH nanoparticles exhibited an excellent tunable detecting performance in the range from pH = 4 to pH = 9. This is explained that the swelling-shrinking behavior of responsive PAH can control the distance between Ag NPs and the target molecules under external pH stimuli, resulting in the tunable LSPR and further controlled SERS. Furthermore, Ag@PAH nanoparticles possessed an ultra-sensitive detecting ability and the detection limit of Rhodamine 6G reduced to 10 M. These advantages qualified Ag@PAH NP as a promising smart SERS substrate in the field of trace analysis and sensors.
首次制备了一种新型的pH响应性银@聚丙烯酰肼（Ag@PAH）纳米粒子，作为表面增强拉曼散射（SERS）基底，无需还原剂和封端剂。Ag@PAH纳米粒子在pH = 4至pH = 9范围内表现出优异的可调检测性能。这可以解释为，响应性PAH的溶胀-收缩行为可以在外部pH刺激下控制Ag NPs与目标分子之间的距离，从而导致可调的局域表面等离子体共振（LSPR）和进一步可控的SERS。此外，Ag@PAH纳米粒子具有超灵敏的检测能力，罗丹明6G的检测限降至10⁻⁹ M。这些优点使Ag@PAH纳米粒子成为痕量分析和传感器领域有前景的智能SERS基底。
