Submicron-sized Ag-polypyrrole/poly(styrene-

co

-methacrylic acid) (Ag-PPy/P(St-

co

-MAA)) composite particles were fabricated

via

a redox reaction between pyrrole and AgNO

3

in the presence of P(St-

co

-MAA) soap-free latex. The products are characterized by transmission electron microscopy (TEM)

electron diffraction spectra (EDS)

Raman spectra

thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The results showed that Ag-PPy nanocomposites were

in situ

deposited onto the surface of P(St-

co

-MAA) latex particles tailored by carboxylic-acid groups. The nanocomposites of Ag-PPy distributed on the surface of polymer particles transformed from discretely dots to continuously coating as the reaction temperature increased from 15℃ to 60℃. Strawberry-like composite particles were obtained at the reaction temperature of 60℃. The TGA characterization confirmed that the Ag-PPy nanocomposites loading onto the P(St-

co

-MAA) particles were systematically controlled over a range of 6 wt%−42 wt% by changing the reaction temperatures. The fluorescence quenching effect of the Ag-PPy/P(St-

co

-MAA) composite particles was explored on Rhodamine B as a model molecule with the Stern-Völmer quenching constant KSV of 5.9 × 104 (g/mL)−1. It is suggested that the fluorescence quenching effect is caused by the resonance energy transfer mechanism.