Effect of surface modification by self-assembled monolayer on the ZnO film ultraviolet sensor

Chen, Tse Pu; Lee, Kai Hsuan; Chang, Sheng; Chang, Shoou Jinn; Chang, Ping

doi:10.1063/1.4813107

Cited by 8 publications

(7 citation statements)

References 19 publications

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“…Deconvolution based on the Gaussian distribution revealed that each of these peaks contained two subpeaks identified as from the p-SiOCH and assembled APTMS molecules. Among which, the intensities of the parent p-SiOCH (103.0 eV) subpeak gradually diminished, associated with the appearance of a new subpeak at approximately 102.2–102.4 eV collectively contributed from the O–Si–O bridges , and Si–OCH 3 dangling groups , of the assembled APTMS nanolayers. Ultimately at 60 min, the parent p-SiOCH (103.0 eV) subpeak disappeared, leaving only a symmetric peak centered at 102.2 eV (≥60 min), which is a characteristic of fully assembled APTMS monolayers. , …”

Section: Resultsmentioning

confidence: 99%

Chemical-Structure Evolution Model for the Self-Assembling of Amine-Terminated Monolayers on Nanoporous Carbon-Doped Organosilicate in Tightly Controlled Environments

et al. 2020

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Amine-terminated self-assembled monolayers are molecular nanolayers, typically formed via wet-chemical solution on specific substrates for precision surface engineering or interface modification. However, homogeneous assembling of a highly ordered monolayer by the facile, wet method is rather tricky because it involves process parameters, such as solvent type, molecular concentration, soaking time and temperature, and humidity level. Here, we select 3-aminopropyltrimethoxysilane (APTMS) as a model molecule of aminosilane for the silanization of nanoporous carbon-doped organosilicate (p-SiOCH) under tightly controlled process environments. Surface mean roughness (R a) and the water contact angle (θ) of the p-SiOCH layers upon silanization at a 10% humidity-controlled environment behave similarly and follow a three-stage evolution: a leap to a maximum at 15 min for R a (from 0.227 to 0.411 nm) and θ (from 25 to 86°), followed by a gradual decrease to 0.225 nm and 69o, finally leveling off at the above values (>60 min). The −NH3 + fraction indicating monolayer disorientation evolves in a similar fashion. The fully grown monolayer is highly oriented yielding an unprecedented low −NH3 + fraction of 0.08 (and 0.92 of upright −NH2 groups). However, while having a similar thickness of approximately 1.4 ± 0.1 nm, the molecular layers grown at 30% relative humidity exhibit a significantly elevated −NH3 + fraction of 0.42, indicating that controlling the humidity is vital to the fabrication of highly oriented APTMS molecular layers. A bonding-structure evolution model, as distinct from those offered previously, is proposed and discussed.

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Section: Resultsmentioning

confidence: 99%

Chemical-Structure Evolution Model for the Self-Assembling of Amine-Terminated Monolayers on Nanoporous Carbon-Doped Organosilicate in Tightly Controlled Environments

et al. 2020

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“…Wang et al [15] used Ag nanoparticles decorating ZnO NR surfaces to facilitate the separation of photogenerated carriers and improve the photo response performance of the UV photodetectors. Chen et al [16] modified a 3-aminopropyltrimethoxysilane monolayer on the surface of the ZnO film to reduce the negative influences of adsorbed oxygen molecules and improve the performance of the ZnO UV sensor. Among various oxide semiconductor materials, CuO is a common metal oxide, which is an intrinsic p-type semiconductor and shows a small band gap (1.2 eV) [17].…”

Section: Introductionmentioning

confidence: 99%

CuO/ZnO Heterojunction Nanorod Arrays Prepared by Photochemical Method with Improved UV Detecting Performance

Zhao

Shirolkar

et al. 2019

Nanomaterials

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CuO/ZnO heterojunction nanorod arrays were synthesized using a facile photochemical deposition strategy. The morphology of CuO was related to the concentration of Cu2+ in the Cu(NO3)2 solution, UV illumination time, and the air annealing temperature. A possible reaction mechanism was proposed. In the photochemical deposition process, the OH− was generated in the vicinity of the ZnO nanorod arrays and reacted with Cu2+ and NO3− in the solution to form Cu2(NO3)(OH)3/ZnO heterojunction nanorod arrays firstly, which were converted into CuO/ZnO heterojunction nanorod arrays completely after air annealing at a low temperature. The fabricated CuO/ZnO heterojunction nanorod arrays exhibits a well-defined rectifying characteristic and an improved photo-response performance compared with pure ZnO nanorod arrays.

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“…The primary interest in this work stemmed from our ongoing work, utilizing surface modified ZnO QDs interfaced with conductive polymers to form hybrid UV photodetectors. This type of hybrid material can be applied in the other hybrid devices such as solar cells [15], gas sensors [16], transistors [17], etc. It is of note that the electronic and physical properties of interfaces between ZnO and other materials can be changed by modifying the surface of ZnO with organic molecules [18,19] …”

Section: Introductionmentioning

confidence: 99%

Photoluminescence investigation of ZnO quantum dots surface modified with silane coupling agent as a capping agent

Moghaddam

Youzbashi

Kazemzadeh

et al. 2015

Journal of Luminescence

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Effect of surface modification by self-assembled monolayer on the ZnO film ultraviolet sensor

Cited by 8 publications

References 19 publications

Chemical-Structure Evolution Model for the Self-Assembling of Amine-Terminated Monolayers on Nanoporous Carbon-Doped Organosilicate in Tightly Controlled Environments

Chemical-Structure Evolution Model for the Self-Assembling of Amine-Terminated Monolayers on Nanoporous Carbon-Doped Organosilicate in Tightly Controlled Environments

CuO/ZnO Heterojunction Nanorod Arrays Prepared by Photochemical Method with Improved UV Detecting Performance

Photoluminescence investigation of ZnO quantum dots surface modified with silane coupling agent as a capping agent

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