tailieunhanh - Báo cáo hóa học: " Size-controlled synthesis of monodispersed gold nanoparticles via carbon monoxide gas reduction"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Size-controlled synthesis of monodispersed gold nanoparticles via carbon monoxide gas reduction | Young et al. Nanoscale Research Letters 2011 6 428 http content 6 1 428 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Size-controlled synthesis of monodispersed gold nanoparticles via carbon monoxide gas reduction InconH IC Vm mm 1 1 I3C1 3CCÌ3 Ạ I o A inclzi2t Dnhorf I I 2nncnor2t I fonnoH 2 Arfhi tx3i 3n3r3 3n3 Joseph I K louiig Nastassja A Levvilski Robert J Ldliysiiei Laura C Nelliedy AHIH Satyai larayal Vengadesan Nammalvar2 Adam Y Lin2 and Rebekah A Drezek1 2 Abstract Al il depth alalysis of gold nanoparticle AuNP sylthesis ald size tulilg utilizilg carbol moloxide CO gas as a reducilg agelt is preselted for the first time. The sizes of the AuNPs are tulable from 4 to 100 lm by alterilg the colceltratiol of HAuCl4 ald illet CO gas-iljectiol flow rate. It is also fould that speciatiol of aqueous HAuCl4 prior to reductiol ilfluelces the size morphology ald properties of AuNPs whel reduced with CO gas. Elsemble extilctiol spectra ald TEM images provide clear evidelce that CO reductiol offers a high level of molodispersity with staldard deviatiols as low as 3 . Upol sylthesis lo excess reducilg agelt remails il solutiol elimilatilg the leed for purificatiol. The time lecessary to sylthesize AuNPs usilg CO is less thal 2 mil. Background Metallic nanoparticles have attracted substantial attention due to their distinctive properties and various applications. AuNPs can exhibit a strong optical response to the extinction of surface plasmons by an alternating electromagnetic field 1 . By simply adjusting the size of the gold nanoparticles this optical resonance can be positioned over hundreds of nanometers in wavelength across the visible into the near infrared spectrum 1 2 . Since these oscillations are located on the boundary of the metal and the external medium these waves are very sensitive to changes in this boundary such as the absorption of molecules to the metal surface 3 . These features render AuNPs .