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1511162 
Journal Article 
Green synthesis of biopolymer-silver nanoparticle nanocomposite: an optical sensor for ammonia detection 
Pandey, S; Goswami, GK; Nanda, KK 
2012 
Yes 
International Journal of Biological Macromolecules
ISSN: 0141-8130
EISSN: 1879-0003 
51 
4 
583-589 
English 
22750580 
WOS:000309310500034 
Biopolymer used for the production of nanoparticles (NPs) has attracted increasing attention. In the presence article we use aqueous solution of polysaccharide Cyamopsis tetragonaloba commonly known as guar gum (GG), from plants. GG acts as reductive preparation of silver nanoparticles which are found to be <10 nm in size. The uniformity of the NPs size was measured by the SEM and TEM, while a face centered cubic structure of crystalline silver nanoparticles was characterized using powder X-ray diffraction technique. Aqueous ammonia sensing study of polymer/silver nanoparticles nanocomposite (GG/AgNPs NC) was performed by optical method based on surface plasmon resonance (SPR). The performances of optical sensor were investigated which provide the excellent result. The response time of 2-3 s and the detection limit of ammonia solution, 1 ppm were found at room temperature. Thus, in future this room temperature optical ammonia sensor can be used for clinical and medical diagnosis for detecting low ammonia level in biological fluids, such as plasma, sweat, saliva, cerebrospinal liquid or biological samples in general for various biomedical applications in human. 
Ammonia sensor; Biopolymer; Silver nanoparticles; Nanocomposite; Surface Plasmon resonance