Precise detection of a trace substance that intrinsically
possesses
weak chemical activity and less-distinctive spatial structure is of
great significance, but full of challenges, as it could not be effectively
recognized via either an active covalent reaction process or multiple
noncovalent interactions toward its simple structure. Here, the electronic-effect-driven
recognition strategy was proposed to visually sense an illicit drug,
γ-hydroxybutyric acid (GHB), which was treated as an analyte
model due to its inherent simple structure. In particular, a sensing
system composed of two probes substituted by the nitro (-NO2) and the hydrogen (-H), was constructed with the characteristic
yellow coloring and blue fluorescence, as well as high sensitivity
(0.586 ng/mL), fast response (0.2 s), and specific recognition, even
in the presence of 22 interferents. In addition, a portable eyeshadow
box-like sensing chip was fabricated and proven to be reliable and
feasible in sensing GHB disguised in liquors for self-protection in
a covert manner. Hence, this work developed an electronic-effect-driven
modulation strategy of the recognition interaction between the probe
and the analyte and, thus, would open up a new thought for detecting
the analyte with weak activity and a simple structure, as well as
propel the relevant application in real scenarios.