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Table 2 Positions of free and coordinated C = O bands in Ag/PVP with four kinds of MWs

From: Investigation on the role of the molecular weight of polyvinyl pyrrolidone in the shape control of high-yield silver nanospheres and nanowires

System	MW
	8,000	29,000	40,000	1,300,000
FT-IR (cm^-1)	1,640	1,644	1,636	1,633
Redshift (cm^-1)	20	16	24	27

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