Visual optical information encryption–decryption and anti-counterfeiting (IEDAC) technology play a vital role in the field of information security. Recent luminescent information encryption technologies face the disadvantages of depending on external large-scale stimulus decryption equipment, inability to read out repeatedly, and information leakage, impeding the practical applications of luminescence encryption. Here, an integrated luminescent IEDAC chip is proposed, which provides a convenient approach to store and decipher pre-patterned luminescence information based on laser engraved template and film heater. The luminescent encryption chip contains a double-layer structure made up of long persistent phosphors based on SrCaGa 4 O 8 host and a laser induced graphene heater, which makes it possible to decrypt information on a single chip. This design enables dual-mode (photoluminescence/long persistent luminescence), dual-color (blue/yellow-green), and multi-level IEDAC function, providing a novel insight and integrated strategy for implementing advanced IEDAC technologies.
Zhishan Liang,Yingming Ma,Ying He,Mengjiao Dai,Dongxue Han
Abnormal dopamine (DA) levels are implicated in numerous physiological disorders—including Parkinson's and Alzheimer's diseases—necessitating highly sensitive and selective analytical methods. Here we report a bismuth tungstate nanoparticle-modified glassy‑carbon electrode (Bi 2 WO 6 NPs/GCE) that enables chronoamperometric DA sensing with excellent electrocatalytic activity. Operating at an oxidation potential of +0.46 V, the sensor responds linearly to DA from 5 nM to 345 μM (R 2 = 0.9997) and offers a detection limit of 2.7 nM. To further miniaturise the platform, Bi 2 WO 6 NPs were drip-coated onto a laser-induced graphene pattern on eco-friendly polyvinyl chloride laser-induced graphene (PVC-LIG), producing a Bi 2 WO 6 NPs/Chip that functions inside a home-built integrated device. The chip requires only 70 μL electrolyte, operates at a lower potential (+0.22 V), and detects DA from 0.5 to 100 μM with a 14 nM detection limit. Both configurations exhibit excellent reproducibility (RSD < 1 %) and have been successfully applied to spike-and-recovery assays in human serum, demonstrating their promise for point-of-care DA monitoring.
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