Fig. 4
From: Hybrid nanodiamond quantum sensors enabled by volume phase transitions of hydrogels
Reversibility test of the hybrid sensor for temperature sensing. a Typical ODMR spectra of a single hybrid sensor taken below LCST (32.8 °C, swollen state, upper pane) and above LCST (40.0 °C, collapsed state, lower pane). The measurements at high and low temperatures are carried out sequentially and repeated for six cycles. The two-peak Lorentz fitting is shown as gray lines. b The average FWHM of the two fitted peaks, and c the peak shift fs measured in six cycles of alternating low and high temperatures. The vertical error bars in b, c are the fitting errors
