In this study, we demonstrate the potential manufacturing method and application of 2D WSe2-based field-effect transistors (2D-FETs) as a promising biosensor for the selective and rapid detection of a pathogen such as SARS-CoV-2 in vitro. The sensors are manufactured by first synthesizing 2D material on Si/SiO2 substrates, followed by photolithography processes to form the FET devices. Then, the surface of 2D material WSe2 has been functionalized with a specific antibody to selectively detect the SARS-CoV-2 spike protein. The TMDC-based 2D-FETs can potentially serve as sensitive and selective biosensors for the rapid detection of infectious diseases.
The use of printed electronics is rising fast as we move toward the internet of things (IoT). Today, most printed electronics are printed on nonbiodegradable polymers resulting in an exponential increase in E-waste formation. The current printing technologies are liquid/ink-based which are not compatible with biodegradable substrates such as papers. Here, we introduce a novel dry printing method to print conductive silver patterns on biodegradable papers. The effect of different printing parameters on the paper burning threshold is investigated, and the electrical characteristics of the lines are characterized for different line thicknesses and widths. Furthermore, the mechanical properties of the lines are studied by bending, twisting, and adhesion tests. This dry printing technology can pave the way toward eco-friendly and biodegradable papertronics.
This study investigates the Candida albicans biofilm formation on different phases of titanium dioxide (TiO2) and titanium disulfide (TiS2) directly grown on titanium substrates. The Candida albicans growth is evaluated by counting the cells in media and surface as well as using colorimetric XTT assays for evaluating biofilm formation. Also, the viability and adhesion of human gingival fibroblast cells to the material's surface is investigated to show the non-toxicity and cell adhesion to these surface. TiS2 nanoflakes growth from titanium substrates showed significant improvement in both the cell attachments and antimicrobial effect.
In this study, we demonstrate the potential application of 2D monolayer WSe2-based field-effect transistors (2D-FETs) as a promising biosensor for the selective and rapid detection of SARS-CoV-2 in vitro. The sensors are manufactured by first growing the 2D crystals on Si/SiO2 substrates, followed by photolithography processes to form the FET devices. WSe2 crystals are then functionalized with a specific antibody to selectively detect the SARS-CoV-2 spike protein. We demonstrate a detection limit of down to 25 fg/μL in 0.01 PBS. The TMDC-based 2D-FETs can potentially serve as sensitive and selective biosensors for the rapid detection of infectious diseases.
Here we report the direct growth of hierarchically architectured molybdenum disulfide (MoS2) and tungsten disulfide (WS2) crystals on molybdenum and tungsten substrates through an innovative hybrid fabrication method involving laser structuring coupled with a sulfurization process. This laser surface modification process not only provides the ability to design specific micro/nanostructured patterns but also significantly enhances the sulfurization and MoS2 growth kinetics. The electrochemical performance of the architectured MoS2 and WS2 electrodes are investigated in a solid-state lithium-ion battery to demonstrated their enhanced functionality compared to their unstructured counterparts. The improved cycling performance is attributed to the open channels between the 2D layers and more space available for expansion/contraction due to Li-ion insertion and extraction.
The scalable and patterned growth of two-dimensional (2D) quantum materials is essential for wafer-scale device integration in order to transition their exciting properties and performance from lab to fab. However, the current gas-phase synthesis methods are incompatible with conventional patterning technologies (e.g., lithography) or require extensive top-down processing steps (e.g., etching) to create the desired device structures on the substrates. In this talk, I will describe some of the laser-based approaches we are undertaking to control the synthesis and integration of various 2D materials. I will particularly highlight our recently developed condensed phase growth approach compatible with direct laser writing as well as the conventional lithography and device integration technologies.
Two-dimensional (2D) materials have been viewed as a promising candidate for future electronic, optoelectronic, and photonic applications. This, however, demands controlled synthesis and precise integration of such materials with complex patterns onto rigid and flexible substrates. Here we introduce a new laser-based approach that enables the integration of 2D materials onto the flexible and rigid substrate with desired shapes and patterns. We report direct laser crystallization and the pattering of MoS2 and WSe2 on PDMS and quartz substrates. A thin layer of solid-state stoichiometric amorphous 2D film is deposited onto the substrates, followed by a controlled crystallization and direct writing process using a tunable nanosecond laser (1064 nm). This novel method enables the use of emerging 2D materials in future electronics, optoelectronics, and photonics applications where intricate patterning and/or flexible substrates are required.
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