Aminocalix[4] arene monolayers as magnetoelastic sensor sensing elements for selective detection of benzo[a] pyrene

摘要

A wireless magnetoelastic-sensing device for the selective detection of benzo[a] pyrene (BaP) is reported using aminocalix[4] arene (AC(4)) monolayers as the sensor sensing elements and AC(4)-modified Au nanoparticles (AC(4)-Au NPs) as signal-amplifying tags. A sandwich-type detection strategy involves the AC(4) self-assembled on the Au-protected sensor surface and AC(4)-Au NPs, both of which flank the BaP target in sequence. As the AC(4)-Au NPs combined BaP absorbs on the sensor's surface, there is an increase in the mass load on the sensor, and consequently a decrease in resonance frequency. Under optimal conditions, the sensor shows a linear response to the concentration of BaP in the range of 1.04 x 10 (7) M to 1.04 x 10 (11) M, with a detection limit of 5.0 x 10 (11) M. Other polycyclic aromatic hydrocarbons (PAHs) and environmental pollutants show no interference on the detection.