title: Green synthesis of polysaccharide/gold nanoparticle nanocomposite: an efficient ammonia sensor.
abstract: A low cost eco-friendly method for the synthesis of gold nanoparticles (AuNPs) using guar gum (GG) as a reducing agent is reported. The nanoparticles obtained are characterized by UV-vis spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Based on these results, a potential mechanism for this method of AuNPs synthesis is discussed. GG/AuNPs nanocomposite (GG/AuNPs NC) was exploited for optical sensor for detection of aqueous ammonia based on surface plasmon resonance (SPR). It was found to have good reproducibility, response times of ∼10 s and excellent sensitivity with a detection limit of 1ppb (parts-per-billion). This system allows the rapid production of an ultra-low-cost GG/AuNPs NC-based aqueous ammonia sensor.
authors.affiliation: Materials Research Centre, Indian Institute of Science, Bangalore 560012, India. Sadanand.au@gmail.com
authors.forename: Sadanand
authors.initials: S
authors.lastname: Pandey
authors.forename: Gopal K
authors.initials: GK
authors.lastname: Goswami
authors.forename: Karuna K
authors.initials: KK
authors.lastname: Nanda
mesh_terms: D000641:Ammonia / Q000032:analysis*; D031293:Cyamopsis / Q000737:chemistry; D005685:Galactans / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D055772:Green Chemistry Technology; D008351:Mannans / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D010316:Particle Size; D053149:Plant Gums / Q000737:chemistry*; D019163:Reducing Agents / Q000737:chemistry; D013053:Spectrophotometry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D005685:Galactans; D008351:Mannans; D053149:Plant Gums; D019163:Reducing Agents; D014874:Water Pollutants, Chemical; D006046:Gold; D000641:Ammonia; C007894:guar gum