Aggregates grown from thin films

PbS has been deposited from an acidic bath using thiosulphate. Also, very thin films of PbS (maximum absorbance <0.015) have been grown on quartz immersed overnight in a solution of Pb ions together with polyvinyl alcohol (ostensibly to protect against aggregation of colloids) through which H2S has been passed. 

Raman-NSOM has been demonstrated for a variety of samples, including adsorbed dye molecules [358-361] and polymers [357]. By combining NSOM with SERS molecular spectroscopy and imaging with a lateral resolution of 70 nm is possible [337], Also IR-NSOM can be used for chemical imaging [338], Thin him analysis benefits from NSOM. The technique has been used to probe the excitonic transitions in J-aggregates of l,l -diethyl-2,2-cyanineiodide grown in poly(vinyl sulfate) thin films [290]. 

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