A Flexible Humidity Sensor with Wide Range, High Linearity, and Fast Response Based on Ultralong Na₂Ti₃O₇ Nanowires

Abstract

A flexible humidity sensor with wide sensing range, superior sensitivity, high linearity, and advanced response/recovery capabilities is extremely desirable for practical applications in human body-related (HBR) monitoring and human-machine interaction (HMI). However, the practical sensor lacks a versatile nanomaterial integrated with sensing capabilities and mechanical flexibility to meet the criteria. Herein, a comprehensive flexible humidity sensor with ultralong Na2Ti3O7 nanowires (>120 μm) is subtly constructed for the first time. Owing to the distinguish nanowires network structure, the sensor exhibits wide sensing range (11–95% RH), high sensitivity (>103), high linearity (R2 > 0.98), and fast response/recovery capability (8.9/2.1 s), as well as excellent respiratory stability (>5000 s). In addition, the Na2Ti3O7-based humidity sensor demonstrates superior flexibility and antibacteria capabilities, and exhibits diverse applications in respiration monitoring, noncontact detection, as well as dynamic interactive display. This work provides a multifunctional humidity sensor with excellent practicability, suggesting the great potential in next-generation human-related flexible/wearable devices.

Fast response flexible humidity sensors based on Ti3C2Tx MXene-heterostructures for multifunctional applications

“…The straight line implies the Warburg impedance ( Z w ), which predominantly arises from the charge carrier transfer of H 3 O + migration within the Ti 3 C 2 T x /SnO 2 layers. 56 These CIS experimental results further confirm the proposed humidity sensing mechanism.…”

Hybrid Water-Harvesting Channels Delivering Wide-Range and Supersensitive Passive Fluorescence Humidity Sensors

“…In addition, the humidity sensitivity of PFHS- 3 was proved to be durable in a consecutive “dry/wet” alternating process (7% RH/98% RH) over 10 cycles, which was supported by the nearly unchanged emission maximum values (Figure c). As shown in Figure d and Table S1, in terms of detection range and the lower limit, PFHS- 3 outperforms most previously reported moisture-sensitive materials, such as MXene, − semiconductor, ,− carbon, ,− fluorescent-based, − etc., which might be due to the enhanced water-harvesting and diffusing capabilities by the synergy of the hybrid channels.…”