Fig. 1. Preparation principle of GO-AuNPs-GOD complex

Fig. 2. Principle of the colorimetric method for glucose solution detection

Fig. 3. Characterization of GO-AuNPs composite nanoparticles. (a) UV absorption spectra; (b)(c) TEM image

Fig. 4. Survival rate of cells cultured with different mass concentrations of GO-AuNPs composite nanoparticles for different periods

Fig. 5. Characterization of GO-AuNPs-GOD composites nanoparticles. (a) UV absorption spectra; (b) Raman spectra

Fig. 6. Zeta potential test diagram of complex

Fig. 7. Effect of particle size on sensor

Fig. 8. Effect of Au /GO volume ratio on sensor performance

Fig. 9. Effect of GOD mass concentration on sensor performance

Fig. 10. Effect of pH on sensor performance

Fig. 11. Sensitivity of the sensor. (a) Absorption spectra at different glucose mass concentrations; (b) relationship between the change of absorption wavelength and glucose mass concentration

Fig. 12. Selectivity of sensor