Localized Surface Plasmon Resonance Effect of Gold Nanoparticles Using 3-Mercaptopropionic Acid as Capping Material for Sensing Probe

• DOI: 10.4028/www.scientific.net/kem.891.43
• Publication Date: 2021-07-06T07:52:28Z
• Authors: Muhammad Tegar Pa...; Suhandoko Dwi Isro; Priastuti Wulandari
• Keywords: Absorbance

Gold nanoparticles (AuNP) has been used in a wide range of applications especially medicine and optoelectronic due to its localized surface plasmon resonance (LSPR) effect. LSPR observation AuNP solution shows that the plasmonic peak absorbance spectra lies visible light around 520 nm with deep red-wine color. The optical characteristic is controlled by size shape including functionalization. Our research focused on adsorption study 3-mercaptopropionate (3-MP) (AuMP) synthesized ligand exchange method also direct reduction method. characterizations are conducted use UV-vis FTIR spectroscopies order investigate effect LSPR. show both experimental methods AuMP give similar profile red-shifted peaks comparison citrate-capped as reference from 519 nm. synthesis results an unstable colloidal after being stored for week at room temperature while stable even though it 2 months. difference vibrational intensities between 3-MP 3-MPA reference. carboxylate (COO-) asymmetric stretching shifted low frequency 1708 cm -1 1632 indicate shift high frequencies some relates strong chemical coordination gold capping material. simulation vibration energy Density Functional Theory (DFT) tendency along infrared spectrum results.