國立虎尾科技大學 |

Applications of van der Waals Thin Films.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Applications of van der Waals Thin Films./
Author:	Xu, Dong.
Description:	1 online resource (230 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 84-09, Section: B.
Contained By:	Dissertations Abstracts International84-09B.
Subject:	Materials science. -
Online resource:	click for full text (PQDT)
ISBN:	9798377643647

Applications of van der Waals Thin Films.
Xu, Dong.

Applications of van der Waals Thin Films. - 1 online resource (230 pages)

Source: Dissertations Abstracts International, Volume: 84-09, Section: B.

Thesis (Ph.D.)--University of California, Los Angeles, 2023.

Includes bibliographical references

The 2D materials have drawn great interests since they have been exploited. Although they have excellent properties, the mass production has been a great challenge. To overcome this, a solution proceeded approach was introduced in 2018. The MoS2 ink is prepared by intercalating ammonia salt into the raw material and exfoliated the bulk materials into small thin flakes and get a suspension solution. This MoS2 ink can be easily spin−coated on to hydrophilic surface and form a uniform large−scaled semiconducting thin film with high performance. The thin films are made of flakes overlapped with each other by van der Waals force, so we call them van der Waals thin film (VDWTF). And my projects are main about the applications of the VDWTF. The first application is using the thin film as conventional transistors. And we manage to build an integrated pressure sensor array, by combining solution-processed two-dimensional (2D) MoS2 van der Waals (vdW) thin film transistor (TFT) active matrix and conductive micropyramidal pressure-sensitive rubber (PSR) electrodes made of polydimethylsiloxane/carbon nanotube composites, to achieve spatially revolved pressure mapping with excellent contrast and low power consumption. We demonstrate a 10 x 10 active matrix by using the 2D MoS2 vdW-TFTs with high on-off ratio > 106 , minimal hysteresis, and excellent device-to-device uniformity. The combination of the vdW-TFT active matrix with the highly uniform micropyramidal PSR electrodes creates an integrated pressure sensing array for spatially resolved pressure mapping. This study demonstrates that the solution-processed 2D vdW-TFTs offer a solution for active-matrix control of pressure sensor arrays, and could be extended for other active matrix arrays of electronic. Because the thin film MoS2 has a high light transmission rate, our thin film can applied for optoelectronic devices as transparent transistor. Here we merge our thin film transparent phototransistors (TPTs) with liquid crystal (LC) modulators to create an optoelectronic neuron array that allows self-amplitude modulation of spatially incoherent light, achieving a large nonlinear contrast over a broad spectrum at orders-of-magnitude lower intensity than most optical nonlinear materials. For a proof-of-concept demonstration, we fabricated 10,000 optoelectronic neurons, each serving as a nonlinear filter, and experimentally demonstrated an intelligent imaging system that uses their nonlinear response to significantly reduce input glares while retaining the weaker-intensity objects within the field of view of a cellphone camera. This nonlinear glare-reduction capability is important for various imaging applications, including autonomous driving, machine vision, and security cameras. Beyond imaging and sensing, this optoelectronic neuron array, with its nonlinear self-amplitude modulation for processing incoherent broadband light, might also find applications in optical computing, where nonlinear activation functions that can work under ambient light conditions are highly sought. In the next chapter, we demonstrate the application of the VDWTF as flexible electronics. The films feature a sliding and rotation degree of freedom among the staggered nanosheets to ensure mechanical stretchability and malleability, as well as a percolating network of nanochannels to endow permeability and breathability. With an excellent mechanical match to soft biological tissues, the freestanding films can naturally adapt to local surface topographies and seamlessly merge with living organisms with highly conformal interfaces, rendering living organisms with electronic functions, including leaf-gate and skin-gate transistors. On-skin transistors allow high-fidelity monitoring and local amplification of skin potentials and electrophysiological signals.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798377643647Subjects--Topical Terms:

557839
Materials science.
Subjects--Index Terms:

2D materialsIndex Terms--Genre/Form:

554714
Electronic books.

Applications of van der Waals Thin Films.
LDR:05227ntm a22003977 4500 001 1151799
005 20241118135824.5
006 m o d
007 cr mn ---uuuuu
008 250605s2023 xx obm 000 0 eng d
020 $a 9798377643647
035 $a (MiAaPQ)AAI30313668
035 $a AAI30313668
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Xu, Dong. $3 720194
245 1 0 $a Applications of van der Waals Thin Films.
264 0 $c 2023
300 $a 1 online resource (230 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 84-09, Section: B.
500 $a Advisor: Huang, Yu;Duan, Xiangfeng.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 2023.
504 $a Includes bibliographical references
520 $a The 2D materials have drawn great interests since they have been exploited. Although they have excellent properties, the mass production has been a great challenge. To overcome this, a solution proceeded approach was introduced in 2018. The MoS2 ink is prepared by intercalating ammonia salt into the raw material and exfoliated the bulk materials into small thin flakes and get a suspension solution. This MoS2 ink can be easily spin−coated on to hydrophilic surface and form a uniform large−scaled semiconducting thin film with high performance. The thin films are made of flakes overlapped with each other by van der Waals force, so we call them van der Waals thin film (VDWTF). And my projects are main about the applications of the VDWTF. The first application is using the thin film as conventional transistors. And we manage to build an integrated pressure sensor array, by combining solution-processed two-dimensional (2D) MoS2 van der Waals (vdW) thin film transistor (TFT) active matrix and conductive micropyramidal pressure-sensitive rubber (PSR) electrodes made of polydimethylsiloxane/carbon nanotube composites, to achieve spatially revolved pressure mapping with excellent contrast and low power consumption. We demonstrate a 10 x 10 active matrix by using the 2D MoS2 vdW-TFTs with high on-off ratio > 106 , minimal hysteresis, and excellent device-to-device uniformity. The combination of the vdW-TFT active matrix with the highly uniform micropyramidal PSR electrodes creates an integrated pressure sensing array for spatially resolved pressure mapping. This study demonstrates that the solution-processed 2D vdW-TFTs offer a solution for active-matrix control of pressure sensor arrays, and could be extended for other active matrix arrays of electronic. Because the thin film MoS2 has a high light transmission rate, our thin film can applied for optoelectronic devices as transparent transistor. Here we merge our thin film transparent phototransistors (TPTs) with liquid crystal (LC) modulators to create an optoelectronic neuron array that allows self-amplitude modulation of spatially incoherent light, achieving a large nonlinear contrast over a broad spectrum at orders-of-magnitude lower intensity than most optical nonlinear materials. For a proof-of-concept demonstration, we fabricated 10,000 optoelectronic neurons, each serving as a nonlinear filter, and experimentally demonstrated an intelligent imaging system that uses their nonlinear response to significantly reduce input glares while retaining the weaker-intensity objects within the field of view of a cellphone camera. This nonlinear glare-reduction capability is important for various imaging applications, including autonomous driving, machine vision, and security cameras. Beyond imaging and sensing, this optoelectronic neuron array, with its nonlinear self-amplitude modulation for processing incoherent broadband light, might also find applications in optical computing, where nonlinear activation functions that can work under ambient light conditions are highly sought. In the next chapter, we demonstrate the application of the VDWTF as flexible electronics. The films feature a sliding and rotation degree of freedom among the staggered nanosheets to ensure mechanical stretchability and malleability, as well as a percolating network of nanochannels to endow permeability and breathability. With an excellent mechanical match to soft biological tissues, the freestanding films can naturally adapt to local surface topographies and seamlessly merge with living organisms with highly conformal interfaces, rendering living organisms with electronic functions, including leaf-gate and skin-gate transistors. On-skin transistors allow high-fidelity monitoring and local amplification of skin potentials and electrophysiological signals.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Materials science. $3 557839
650 4 $a Condensed matter physics. $3 1148471
653 $a 2D materials
653 $a Flexible electronics
653 $a Semiconductors
653 $a van der Waals thin films
653 $a Imaging applications
653 $a Optical computing
655 7 $a Electronic books. $2 local $3 554714
690 $a 0794
690 $a 0611
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a University of California, Los Angeles. $b Materials Science and Engineering 0328. $3 1185078
773 0 $t Dissertations Abstracts International $g 84-09B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30313668 $z click for full text (PQDT)