title: New core-shell hyperbranched chitosan-based nanoparticles as optical sensor for ammonia detection.
abstract: In this paper, preparation of new core-shell amino-terminated hyperbranched chitosan nanoparticles (HBCs-NH2) NPs is described. The synthesized nanoparticles were characterized using ninhydrin assay, FTIR, TGA, and FESEM. The newly prepared (HBCs-NH2) NPs were then used as a platform for facile and controlled synthesis of silver nanoparticles (AgNPs) which was confirmed using FTIR, UV-vis spectrometry, X-ray diffraction, SEM and HRTEM. Formation of the AgNPs was also noted upon changing the color of (HBCs-NH2) NPs suspension from colorless into yellow as well as through the appearance of surface plasmon resonance (SPR) peak at 400 nm. HRTEM showed a uniform and spherical morphology of the resulting HBCs-NH2 NPs with average size 400 nm, and the AgNPs were formed mainly on their surface with average size of 20-50 nm. The newly developed (HBCs-NH2) NPs-AgNPs showed a great potential as optical sensor for efficient detection of the ammonia concentration in solutions based on the change in the SPR.
authors: Center for Materials Science, Zewail City of Science and Technology, 6th October City, 12588 Giza, Egypt. Electronic address: ielsherbiny@Zewailcity.edu.eg.
authors: Ibrahim M
authors: IM
authors: El-Sherbiny
authors: Center for Materials Science, Zewail City of Science and Technology, 6th October City, 12588 Giza, Egypt.
authors: Amr
authors: A
authors: Hefnawy
authors: Center for Materials Science, Zewail City of Science and Technology, 6th October City, 12588 Giza, Egypt.
authors: Ehab
authors: E
authors: Salih
mesh_terms: D000641:Ammonia / Q000032:analysis*; D048271:Chitosan / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry; D008958:Models, Molecular; D008968:Molecular Conformation; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation*; D055620:Optical Phenomena; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*
chemical_list: D012834:Silver; D000641:Ammonia; D048271:Chitosan
keywords: Chitosan; Hyperbranched; Nanoparticle; Sensor; Silver