Browsing by Author "Chao, Tieng-Sheng"

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Gray-level patterning of gold nanoparticles with scanning probe lithography of self-assembly monolayer
(2007)
Sheu, Jeng-Tzong
;
Wu, Chia-Hao
;
Liu, Hao-Heng
;
Chao, Tieng-Sheng
;
材料科學與工程學系奈米科技碩博班
Novel Field-Induced Gray-Level Selective Patterning of Self-Assembled Aminosilane Monolayer on SiO(2) Surfaces by Scanning Probe Bond-Breaking Lithography
(2009-04-01)
Wu, Chia-Hao
;
Lee, Ten-Min
;
Sheu, Jeng-Tzong
;
Chao, Tieng-Sheng
;
材料科學與工程學系奈米科技碩博班
We demonstrated a successful strategy for combining the straightforward scanning probe chemical bond-breaking lithography and self-assembly monolayer (SAM) techniques for constructing nanoscale architectural structures of gold nanoparticles (AuNPs) onto modified SiO(2) surfaces. The hydroxyl-terminated surface of the sample substrate was modified by silanization with N-(2-aminoethyl)-3-aminopropyl-trimethoxysilane (AEAPTMS) molecules. Local-field-induced scanning probe bond-breaking lithography is adopted to selectively decompose the chemical bonds of AEAPTMS SAMs on aminosilane-modified SiO(2) surfaces. From the experiments, a tip bias of less than 4.5 V cannot effectively decompose chemical bonds of AEAPTMS SAMs. Gray-level selectively patterned pictures were successfully observed on a modified 2.5-nm-thick SiO(2) surface by applying dc voltage (2.5-5.5V) between the atomic force microscopy (AFM) conductive tip and the SiO(2) surface under ambient conditions. After the scanning probe selective decomposition of AEAPTMS SAMs, AuNPs with negative-charged citrate surfaces were selectively anchored in the selective patterning region via Coulomb electrostatic force. With proper control, it is considered that this novel technique can be applicable to the generation of various nanofabricated devices. (C) 2009 The Japan Society of Applied Physics
Novel Field-Induced Gray-Level Selective Patterning of Self-Assembled Aminosilane Monolayer on SiO2 Surfaces by Scanning Probe Bond-Breaking Lithography
(2009-04-01)
Wu, Chia-Hao
;
Lee, Ten-Min
;
Sheu, Jeng-Tzong
;
Chao, Tieng-Sheng
;
電子物理學系
We demonstrated a successful strategy for combining the straightforward scanning probe chemical bond-breaking lithography and self-assembly monolayer (SAM) techniques for constructing nanoscale architectural structures of gold nanoparticles (AuNPs) onto modified SiO2 surfaces. The hydroxyl-terminated surface of the sample substrate was modified by silanization with N-(2-aminoethyl)-3-aminopropyl-trimethoxysilane (AEAPTMS) molecules. Local-field-induced scanning probe bond-breaking lithography is adopted to selectively decompose the chemical bonds of AEAPTMS SAMs on aminosilane-modified SiO2 surfaces. From the experiments, a tip bias of less than 4.5 V cannot effectively decompose chemical bonds of AEAPTMS SAMs. Gray-level selectively patterned pictures were successfully observed on a modified 2.5-nm-thick SiO2 surface by applying dc voltage (2.5-5.5V) between the atomic force microscopy (AFM) conductive tip and the SiO2 surface under ambient conditions. After the scanning probe selective decomposition of AEAPTMS SAMs, AuNPs with negative-charged citrate surfaces were selectively anchored in the selective patterning region via Coulomb electrostatic force. With proper control, it is considered that this novel technique can be applicable to the generation of various nanofabricated devices. (C) 2009 The Japan Society of Applied Physics
Scanning probe lithography of self-assembled N-(2-aminoethyl)-3-aminopropyltrimethoxysilane monolayers on SiO2 surface
(2007-09-01)
Wu, Chia-Hao
;
Sheu, Jeng-Tzong
;
Chen, Chia Hao
;
Chao, Tieng-Sheng
;
材料科學與工程學系奈米科技碩博班
A new approach is introduced for the selective deposition of colloidal gold nanoparticles (AuNPs) onto the surface of unpatterned self-assembled monolayers (SAMs). The patterning of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (AEAPTMS) SAMs is realized by local field-induced bond breaking using scanning probe lithography (SPL) on a thin SiO2 surface. Different tip/sample biases were investigated to determine the bond breaking efficiency of AEAPTMS SAMs. It was found that bond breaking efficiency was limited by tunneling current through the thin SiO2 film so that both the tip bias and the tip scanning speed play important roles. AuNPs with negatively charged citrate surfaces were selectively anchored onto the unpatterned area via electrostatic force between AEAPTMS SAMs and AuNPs. Single-digit numbers of AuNPs anchored onto unpatterned AEAPTMS SAMs were demonstrated.