Multifunctional two-dimensional glassy graphene devices for vis-NIR photodetection and volatile organic compound sensing

Abstract

Multifunctional devices are of great interest for integration and miniaturization on the same platform, but simple addition of functionalities would lead to excessively large devices. Here, the photodetection and chemical sensing device is developed based on two-dimensional (2D) glassygraphene that meets similar property requirements for the two functionalities. An appropriate bandgap arising from the distorted lattice structure enables glassy graphene to exhibit comparable or even improved photodetection and chemical sensing capability, compared with pristine graphene. Due to strong interactions between glassy graphene and the ambient atmosphere, the devices are less sensitive to photoinduced desorption than the ones based on graphene. Consequently, the few-layer glassy graphene device delivers positive photoresponse, with a responsivity of 0.22 A W −1 and specific detectivity reaching~10 10 Jones under 405 nm illumination. Moreover, the intrinsic defects and strain in glassy graphene can enhance the adsorption of analytes, leading to high chemical sensing performance. Specifically, the extracted signalto-noise-ratio of the glassy graphene device for detecting acetone is 48, representing more than 50% improvement over the device based on graphene. Additionally, bias-voltage-and thickness-dependent volatile organic compound (VOC) sensing features are identified, indicating the few-layer glassy graphene is more sensitive. This study successfully demonstrates the potential of glassy graphene for integrated photodetection and chemical sensing, providing a promising solution for multifunctional applications further beyond.

Macroscopic and microscopic defect management in blue/green photodetectors for underwater wireless optical communication

“…Photodetectors play an important role in a wide range of applications, such as optical communication, image sensing, environmental monitoring, biological detection, etc. [1][2][3][4] Material quality and optical properties of the active region of a photodetector directly determine device performance. [5][6][7] To date, commercial photodetectors mainly rely on group IV, III-V, and II-VI semiconductors, which involve complex manufacturing processes under strictly controlled conditions.…”

Two-Dimensional Field-Effect Transistor Sensors: The Road toward Commercialization

“…developed a multifunctional FET sensor with channels made of glossy graphene, enabling photodetection (responsivity = 0.22 A W 1– ) as well as chemical liquid sensing (response time < 5 s) at the same time. The glossy graphene has distorted lattice-induced Stone–Wales defects with twisted C–C bonds by 90°, which are advantageous for photodetection and chemical sensing. , Photodetection was achieved by interaction between ambient molecules and the Stone–Wales defects of the glossy graphene. Also, these defects provided abundant adsorption sites that were sensitive to chemical analytes (e.g., acetone and methanol).…”

“…Furthermore, this work allows easy incorporation of different functional components such as communication and power modules by the innovative assembly and adhesive strategy, showing its great promise for future in vivo exploration. Similarly, Li et al 356 developed a multifunctional FET sensor with channels made of glossy graphene, enabling photodetection (responsivity = 0.22 A W 1− ) as well as chemical liquid sensing (response time < 5 s) at the same time. The glossy graphene has distorted lattice-induced Stone−Wales defects with twisted C−C bonds by 90°, which are advantageous for photodetection and chemical sensing.…”

“…The glossy graphene has distorted lattice-induced Stone−Wales defects with twisted C−C bonds by 90°, which are advantageous for photodetection and chemical sensing. 100,356 Photodetection was achieved by interaction between ambient molecules and the Stone−Wales defects of the glossy graphene. Also, these defects provided abundant adsorption sites that were sensitive to chemical analytes (e.g., acetone and methanol).…”

A hippocampus-inspired illumination time-resolved device for neural coding

“…Currently, two-dimensional (2D) materials have been widely fabricated to optically modulate artificial synapses due to their excellent photoresponse, well-developed synthesis methodology and potential integration with complementary metal oxide semiconductor (CMOS) technologies [14,[20][21][22][23][24][25][26][27]. For example, Mennel et al [21] have reported a neural network image-senor array [28] based on WSe 2 for ultrafast image recognition and encoding.…”