alexa Green synthesis of polysaccharide gold nanoparticle nanocomposite: an efficient ammonia sensor.


Journal of Microbial & Biochemical Technology

Author(s): Pandey S, Goswami GK, Nanda KK

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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. Copyright © 2013 Elsevier Ltd. All rights reserved. This article was published in Carbohydr Polym and referenced in Journal of Microbial & Biochemical Technology

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