Approximately eight avidin molecules are conjugated to each Ce/Tb‐doped lanthanum phosphate nanoparticle (NP) through the formation of amide bonds (see scheme). This biofunctionalization process comprises modification of the LaPO4 NPs with 6‐aminohexanoic acid (AHA) to confer colloidal stability, activation of the AHA carboxy groups by 1‐ethyl‐3‐[3‐dimethylaminopropyl]carbodiimide, and avidin conjugation.

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We describe a one-step electrochemical co-deposition method to prepare nanoparticle (NP)-containing semiconducting polymer inverse opals with well-defined pore structure. Gold and cadmium telluride NPs were electrodeposited along with pyrrole in the interstitial voids of colloidal crystals of polymer spheres, and following template removal, composite inverse opals were obtained. The optical characteristics (position of the optical stopband) of the resulting composite films can be tuned through variation of the type and concentration of the NPs embedded in the film.

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