Wireless Self-Powered High-Performance Integrated Nanostructured-Gas-Sensor Network for Future Smart Homes

Abstract

The accelerated evolution of communication platforms including Internet of Things (IoT) and the fifth generation (5G) wireless communication network makes it possible to build intelligent gas sensor networks for real-time monitoring chemical safety and personal health. However, this application scenario requires a challenging combination of characteristics of gas sensors including small formfactor, low cost, ultralow power consumption, superior sensitivity, and high intelligence. Herein, self-powered integrated nanostructured-gas-sensor (SINGOR) systems and a wirelessly connected SINGOR network are demonstrated here. The room-temperature operated SINGOR system can be self-driven by indoor light with a Si solar cell, and it features ultrahigh sensitivity to H2, formaldehyde, toluene, and acetone with the record low limits of detection (LOD) of 10, 2, 1, and 1 ppb, respectively. Each SINGOR consisting of an array of nanostructured sensors has the capability of gas pattern recognition and classification. Furthermore, multiple SINGOR systems are wirelessly connected as a sensor network, which has successfully demonstrated flammable gas leakage detection and alarm function. They can also achieve gas leakage localization with satisfactory precision when deployed in one single room. These successes promote the development of using nanostructured-gas-sensor network for wide range applications including smart home/building and future smart city.

Two-Dimensional MoS2 Nanosheet-Functionalized Optical Microfiber for Room-Temperature Volatile Organic Compound Detection

“…A 1g Raman peak observed from the exfoliated MoS 2 is blue-shifted from 403 to 401 cm −1 , while E 2g 1 Raman peak is red-shifted from 377 to 379 cm −1 . The results agree well with the literature that reported the E 2g 1 and A 1g modes are moving toward each other with decreasing layer thickness. 37 Moreover, the Raman peak difference of the exfoliated MoS 2 also approximate the number of MoS 2 layers, and a measured value of 22 cm −1 for the exfoliated MoS 2 dispersion corresponds to double-layer MoS 2 .…”

“…Research in gas sensors has attracted enormous interest due to the importance of industrial emission control, air quality monitoring, and building security . Specifically, volatile organic compounds (VOCs) are critical due to their role in tropospheric chemistry and their lethal effects on human health. , VOCs are gases emitted from either solid or liquid products such as paints, cleaners, and other office supplies such as copiers, adhesives, and furnishing coatings.…”

Recent Progress in the Energy Harvesting Technology—From Self-Powered Sensors to Self-Sustained IoT, and New Applications

“…In brief, solar energy, wind energy, and rain energy, all can be converted into electricity and promised to power sensor nodes in smart home applications. In Figure 4b, Song et al demonstrated a realistically available example for smart homes, titled as a wireless self-powered integrated nanostructured-gas-sensor network (SINGOR) for smart homes [174]. This SINGOR system consists of a power supply module, gas-sensing module, microcontroller-analog readout circuit, and wireless data transmission module, and Song et al had optimized each mode to obtain self-powered ability.…”

“…(b) Wireless self-powered high-performance integrated nanostructured-gas-sensor network (Reprinted with permission from ref. [174]. Copyright 2021 American Chemical Society).…”

“…Copyright 2016 American Chemical Society). (b) Wireless self-powered high-performance integrated nanostructured-gas-sensor network (Reprinted with permission from ref [174]…”