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008			110309s2008 th uu|m rtt 0| a1eng d
035			_a.b12091601
099		9	_aAIT Thesis no.ME-08-02
100	0		_aSiriphun Ameritachot
245	1	0	_aDeveloping a plasmon resonance sensor for heavy metal ion detection
260			_aPathum Thani, Thailand : _bAsian Institute of Technology, _c2008
300			_a57 p. : _billl.
490	1		_aThesis ; _vno. ME-08-02
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Microelectronics, School of Engineering and Technology
502			_aThesis (M.Eng.) - Asian Institute of Technology, 2008
520			_aHeavy metals are widely used in many industr ial fields, for example, copper is used as conductor in electronic devices that is causing increasing environmental concerns. Nanotechnology is a promising discipline that shows promise to impact diverse fields including metal sensors. In order to test heavy metal contaminants in water, we report a novel strategy for using nanoparticles cappe d with polymers (chitosan, crosslinked chitosan, Poly Acrylic Acid (PAA), Poly sodium Styrene Sulfonate (PSS) and glutaraldehyde) for sensing the metal ions. Th e nearly monodispensed nanoparticle of gold was used for the metal ion sensing whic h were obtained by reducing 1 mM of HAuCl 4 with tri sodium citrate in 1:3 ratio. The polycationic nature of polymers utilized for sensing heavy metal ions enables attachment of negatively charged nanoparticles onto the polymers through electrostatic interactions. Use of polymer serves dual pur pose of providing sufficient steric hindrance ensuring stability of the colloid and also the functionalization of gold the nanoparticles for sensing. The well-documented chelating proper ties of chitosan and the sensitivity of the plasmon resonance in gold nanoparticles to agglomeration have been employed to detect low concentrations of heavy metals ions in water. A comparison of the optical absorption spectra of the colloidal suspension before and after exposure to metal ions is a good indicator of the concentration of the heavy meta l ions. In order to complete the chelation of the metal ions, about 1 hour was sufficient for the reaction in most of the cases, but for 0.5% PSS capped gold colloids, the reaction wa s completed within 5 {u2013} 10 minutes. The best sensitivity for copper ion, obtained from the optical sensors, is 200 ppb by using gold colloid capped 0.1% glutaraldehyde crosslinked chitosan. This simple metal ion sensor can be implanted in lab-on-chip type of applications for easier implementation.
650		0	_aSurface plasmon resonance
650		0	_aHeavy metals
650		0	_aNanoparticles
700	1		_aDutta, Joydeep, _eChairperson
700	1		_aAfzulpurkar, Nitin V., _eExamination Committee
700	1		_aShipin, Oleg V., _eExamination Committee
710	2		_aRTG Fellowship, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. ME-08-02
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B03431
907			_a.b12091601 _bmnait _cu
902			_a240402
998			_b0 _c110309 _dm _ea _fu _g0
962			_a000:001:PDF:b1209160:000540:0:0:0:0:0:0 _tAbstract-AIT Thesis no.ME-08-02 _vn
945			_lmnait
945			_lmnarc
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