Fig. 9.

Two-dimensional material-based flexible/wearable sensor for H₂O₂ detection. a Flexible microelectrode based on graphene developed by Peng et al.(Source: reprinted from Peng, Yu Lin, Deqing Justin Gooding, J. Xue, Yuhua Dai, Liming- Flexible fiber-shaped non-enzymatic sensors with a graphene-metal heterostructure based on graphene fibers decorated with gold nanosheets, Carbon (2018) 329–336, with permission from Elsevier). b Diagrammatic representation of the manufacturing of paper-based Cat-Fe₃O₄/rGO electrode and H₂O₂electrocatalytic reduction. (Source: reprinted from Kader Dağcı Kıranşan, Mine Aksoy, Ezgi Topçu- Flexible and freestanding catalase-Fe₃O₄/reduced graphene oxide paper: enzymatic hydrogen peroxide sensor applications, Materials Research Bulletin, 106(2018) 57–6