金纳米球和金纳米棒的制备及其光热催化性能

Preparation and Photothermal Catalytic Properties of Gold Nanospheres and Nanorods

以氯金酸(HAuCl_4)为原料,硼氢化钠(NaBH_4)为还原剂,聚乙烯吡咯烷酮K30(PVP)为稳定剂制备了尺寸5 nm的金纳米球;以阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)为模板剂和油酸钠(NaOL)稳定剂,用种子生长法制备了不同长径比(R=2.5~4)的金纳米棒。在2 W·cm^(-2)的808 nm激光照射10 min条件下,C(0.4 mg·mL^(-1))浓度金纳米球溶液升温10.2℃,该溶液可催化血液中亚硝基硫醇释放NO,最大释放量可达1.42 nmol·L^(-1);相同光热及催化条件下,C(0.4 mg·mL^(-1))浓度金纳米棒(R=3.01)溶液升温41.3℃,该溶液催化血液中亚硝基硫醇释放NO最大释放量可达1.89 nmol·L^(-1)。金纳米球和金纳米棒的光热及催化性能随着浓度增加而增强,金纳米棒的光热及催化性能要优于金纳米球。

Gold nanospheres in size of 5 nm were prepared by chloroauric acid(HAuCl4)as raw material,polyvi-nylpyrrolidone K30(PVP)as a stabilizer and sodium borohydride(NaBH4)as reducing agent.Seed growth method was used to prepare gold nanorods in aspect ratio R ranged from 2.5 to 4,by cationic surfactant cetyltrimethyla-mmonium bromide(CTAB)as template and sodium oleate(NaOL)as stabilizer.Temperature of gold nanospheres solution in concentration of 0.4 mg·mL^-1 rises 10.2℃and the solution catalyzes the release of NO from nitrosothiols in the blood under irradiation of 2 W·cm-2 NIR laser(808 nm)for 10 min,with the maximum release is up to 1.42 nmol·L^-1.Under the same photothermal and catalytic conditions,temperature of gold nanorods(R=3.01)solution in concentration of 0.4 mg·mL^-1 rises 41.3℃and the solution catalyzes the release of NO from nitrosothiols in the blood with the maximum release is up to 1.89 nmol·L^-1.Photothermal effect and the catalytic performance of both nanospheres and nanorods increase with the increase of the concentration,and the catalytic effect and photothermal conversion performance of gold nanorods are superior to those of gold nanospheres.