The growth of surface-immobilized gold nanoparticles with organometallic (OM)CVD on amine-terminated surfaces, utilizing a (trimethylphospine)methylgold ((CH3)3PAuCH3) precursor is described. Samples fabricated using various deposition times are characterized by UV-vis spectroscopy and scanning electron microscopy (SEM). Particle stability on the samples is tested by washing and rinsing treatments with various organic solvents. A biotin-streptavidin scheme is applied to demonstrate the biosensing capabilities of the samples. The size, interparticle distance, and shape of the gold nanoparticles demonstrates that OMCVD is a simple, economic, and fast way of fabricating surface-bonded and stable gold nanoparticles. The plasmonic properties, the stability of the particles, and the biotin-streptavidin test show that these OMCVD-grown gold nanoparticles are suitable for reproducible, low noise, and highly sensitive biosensing applications.