Ultralow detection limit of giant magnetoresistance biosensor using <inline-formula> <img src="cpb_26_1_010701_ieqn1.gif"/> </inline-formula> graphene composite nanoparticle label

Ultralow detection limit of giant magnetoresistance biosensor using

graphene composite nanoparticle label

Xu Jie^{1, 2}, Jiao Ji-qing², Li Qiang¹, Li Shan-dong^{1, 3, †}

(color online) (a) The TEM image of the Fe₃O₄–GN magnetic label, (b) the magnetic hysteresis loop of Fe₃O₄–GN composite at room temperature. The inset in panel (b) shows the enlargement of loop around 0 Oe.