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In s t it u t e of Ph y s ic s P u bl is h in g AbstractT h e m e a s u re m e n t o f o p tic a l e x tin c tio n is u se d to d e te rm in e th e siz e o f n e a rly sp h e ric a l g o ld n a n o p a rtic le s su s p e n d e d in so lu tio n , p ro d u c e d by a re v e rse m ic e lle s p ro c e s s. T h e c o n tra st b e tw e e n th e m a x im u m a n d th e m in im u m in th e e x tin c tio n sp e c tra a ro u n d 4 5 0 a n d 5 2 0 n m sh o w s a lin e a r d e p e n d e n c e w ith th e m e a n ra d iu s o f th e g o ld p a rtic le s le ss th a n 3 n m ; how ever, th e m e th o d c a n b e u se d to siz e p a rtic le s u p to 7 n m . E x p e rim e n ta l re s u lts for ex tin c tio n sp e c tra c a n b e fitte d b y M ie s th e o ry i f th e o p tic a l co n sta n ts fro m b u lk m a te ria l v alu es a re m o d ifie d b y in tro d u c in g th e lim ita tio n o f th e m e a n fre e p a th d u e to c o llisio n s o f c o n d u c tio n e le c tro n s w ith th e b o u n d a ry o f th e n a n o p a rtic le s.

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