Recent Advances in Layered Double Hydroxide-Based Electrochemical and Optical Sensors

Nanomaterials

Arindam Adhikari¹  Andrew Kim²  Rajkumar Patel³  Imre Varga⁴ 

[1] Aadarsh Innovations, Pune 411045, India;Department of Chemical Engineering, The Cooper Union for the Advancement of Science and Art, New York, NY 10003, USA;Energy and Environmental Science and Engineering (EESE), Integrated Science and Engineering Division (ISED), Underwood International College, Yonsei University, 85 Songdogwahak-ro, Yeonsu-gu, Incheon 21983, Korea;Institute of Chemistry, Eötvös Loránd University, 1117 Budapest, Hungary;

关键词: LDH;    electrochemical sensors;    optical sensors;    reduced graphene oxide;   

DOI  :  10.3390/nano11112809

来源: DOAJ

【 摘 要 】

Layered double hydroxides (LDHs) have attracted considerable attention as promising materials for electrochemical and optical sensors owing to their excellent catalytic properties, facile synthesis strategies, highly tunable morphology, and versatile hosting ability. LDH-based electrochemical sensors are affordable alternatives to traditional precious-metal-based sensors, as LDHs can be synthesized from abundant inorganic precursors. LDH-modified probes can directly catalyze or host catalytic compounds that facilitate analyte redox reactions, detected as changes in the probe’s current, voltage, or resistance. The porous and lamellar structure of LDHs allows rapid analyte diffusion and abundant active sites for enhanced sensor sensitivity. LDHs can be composed of conductive materials such as reduced graphene oxide (rGO) or metal nanoparticles for improved catalytic activity and analyte selectivity. As optical sensors, LDHs provide a spacious, stable structure for synergistic guest–host interactions. LDHs can immobilize fluorophores, chemiluminescence reactants, and other spectroscopically active materials to reduce the aggregation and dissolution of the embedded sensor molecules, yielding enhanced optical responses and increased probe reusability. This review discusses standard LDH synthesis methods and overviews the different electrochemical and optical analysis techniques. Furthermore, the designs and modifications of exemplary LDHs and LDH composite materials are analyzed, focusing on the analytical performance of LDH-based sensors for key biomarkers and pollutants, including glucose, dopamine (DA), H₂O₂, metal ions, nitrogen-based toxins, and other organic compounds.

【 授权许可】

Unknown