TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Nanoparticle: The nanoparticle is nano silica (SiO2), nano titanium dioxide (TiO2) or nano tin dioxide (SnO2) (preferably nano silica (SiO2)). Preferred Components: The ionic liquid electrolyte comprises an ionic liquid and an oxidation-reduction derivative. The oxidation-reduction derivative is selected from lithium iodide, sodium iodide, potassium iodide, lithium bromide, sodium bromide, potassium bromide or quaternary ammonium salt.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: In the method (M1), the reacting a nanoparticle with 3-(trimethoxysilyl)propyl methacrylate comprises dispersing the nanoparticle in an organic solvent, adding 3-(trimethoxysilyl)propyl methacrylate to the resultant solution, and refluxing the solution with stirring at room temperature. In the method (M1), the reacting the surface-modified nanoparticle with imidazole comprises dispersing the surface modified nanoparticle in an organic solvent and adding imidazole to the resultant solution. In the method (M1), the reacting the resultant compound with methyl iodide comprises dispersing the resultant compound in an organic solvent and mixing methyl iodide therewith under reflux. Preferred Components: The ionic liquid is prepared by mixing at least one compound selected from n-methylimidazolium iodide, n-ethylimidazolium iodide, ethyl-methyl imidazolium iodide, 1-benzyl-2-methyl imidazolium iodide, 1-ethyl-3-methyl imidazolium iodide, 1-butyl-3-methylimidazolium iodide, methylpyridinium iodide, ethylpyridinium iodide, propylpyridinium iodide, methylethylpyridinium iodide, dimethylpyridinium iodide, ethylmethylimidazolium dicyanamide, or guanidium thiocyanate. The oxidation-reduction derivative is selected from imidazolium salt or a pyridinium salt. EXAMPLE - AEROSIL 200 (RTM: nano silica) (2.5 g) was dispersed in toluene to prepare a solution, and then 3-(trimethoxysilyl)propyl methacrylate (9.8 ml) was added to the solution. After stirring for 1 hour at room temperature, the resulting solution was refluxed for 8 hours. Then, the resulting solution was cooled to room temperature, filtered through filter paper and washed with methanol to obtain nano silica having a surface modified by 3-glycidyloxypropyl trimethoxysilane. Then, the surface modified nano silica (13.5 g) was dispersed in methanol (50 ml). To this solution, imidazole (13.5 g) was added and was stirred for 48 hours at room temperature. After stirring, the resultant was filtered through filter paper, washed with to methanol three times to obtain a nano silica particle to which imidazol was bound. The synthesized material (13.813 g) was dispersed in methanol (50 ml). To this solution, methyl iodide (0.653 g) was mixed and then refluxed for 12 hours to synthesize a nano silica particle (N1) to which an imidazolium salt was chemically bound. An nanogel electrolyte (test) was prepared by mixing the nano silica particle (N1) (0.6 g) and 1 g of an electrolytic solution (comprising 3-methoxypropionitrile+LiI (0.1 M)+I2 (0.05 M)+1-butyl-3-methylimidazolium iodide (0.6 M)+t-butyl pyridine (0.5)). A comparative nanogel electrolyte was prepared by mixing AEROSIL 200 (RTM: nano silica) (0.1 g), and 1 g of an electrolytic solution (3-methoxypropionitrile+LiI(0.1M)+I2 (0.05 M)+1-butyl-3-methylimidazolium iodide (0.6 M)+t-butyl pyridine (0.5)). The test/comparative dye-sensitive solar cell comprising resulting test/comparative nanogel electrolyte was prepared. The results for current density (mA), and photoelectric conversion efficiency (%) of the obtained test/comparative dye-sensitive solar cell were found to be 14.229/13.311 and 8.211/7.825 respectively.