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Sum frequency generation study of immobilized 3-aminopropyltriethoxysilane self-assembled layer on Si(111) substrates

Sum frequency generation study of immobilized 3-aminopropyltriethoxysilane self-assembled layer on Si(111) substrates
Sum frequency generation study of immobilized 3-aminopropyltriethoxysilane self-assembled layer on Si(111) substrates

Distribution and orientation of 3-aminopropyltriethoxysilane (APTES) on a sensing surface play critical role on biosensor, but have not been fully investigated. In this work, the quality of APTES SAM immobilized on the Si(111) substrate was studied by observing sum frequency generation (SFG) response. The polarization, azimuthal angle, and position-dependent SFG spectra of APTES coverage were obtained. In ppp and psp-SFG spectra, the CH2 and CH3 vibrational and NH stretching modes were clearly seen around 3000 cm−1 and around 3300 cm−1 regions, respectively. The spp and ssp-SFG spectra presented too weak signals that the vibrational regions were not clear. The positional and azimuthal angle dependence of the SFG spectra was observed from 0o to 360o with the step of 45o rotation around the surface normal. The 0° is defined as the [(Formula presented.)] direction of Si(111) crystal lying in the incident plane and opposite to the incident k vectors. The appearance of the NH mode was observed to be strongly dependent on the position. The results indicate that the distribution and orientation of APTES molecules were not well ordered on the Si surfaces, suggesting that SFG is an efficient method to check the quality of APTES coverage immobilized on substrates.

APTES, polarization dependence, sum frequency generation, vibrational mode
0142-2421
120-125
Khuat, Thi Thu Hien
ba19e88b-d9d2-4781-ab00-bdcaf32113f4
Liang, Lin
92c5ea15-93fe-4e66-9c8f-2a4a782f0367
Phan, Trong Tue
9b3ee959-9f37-47d8-a3b3-e357b12791b4
Mizutani, Goro
65900bcb-3c20-4fb1-9048-3db4c4cffc6a
Rutt, Harvey N.
e09fa327-0c01-467a-9898-4e7f0cd715fc
Khuat, Thi Thu Hien
ba19e88b-d9d2-4781-ab00-bdcaf32113f4
Liang, Lin
92c5ea15-93fe-4e66-9c8f-2a4a782f0367
Phan, Trong Tue
9b3ee959-9f37-47d8-a3b3-e357b12791b4
Mizutani, Goro
65900bcb-3c20-4fb1-9048-3db4c4cffc6a
Rutt, Harvey N.
e09fa327-0c01-467a-9898-4e7f0cd715fc

Khuat, Thi Thu Hien, Liang, Lin, Phan, Trong Tue, Mizutani, Goro and Rutt, Harvey N. (2019) Sum frequency generation study of immobilized 3-aminopropyltriethoxysilane self-assembled layer on Si(111) substrates. Surface and Interface Analysis, 51 (1), 120-125. (doi:10.1002/sia.6570).

Record type: Article

Abstract

Distribution and orientation of 3-aminopropyltriethoxysilane (APTES) on a sensing surface play critical role on biosensor, but have not been fully investigated. In this work, the quality of APTES SAM immobilized on the Si(111) substrate was studied by observing sum frequency generation (SFG) response. The polarization, azimuthal angle, and position-dependent SFG spectra of APTES coverage were obtained. In ppp and psp-SFG spectra, the CH2 and CH3 vibrational and NH stretching modes were clearly seen around 3000 cm−1 and around 3300 cm−1 regions, respectively. The spp and ssp-SFG spectra presented too weak signals that the vibrational regions were not clear. The positional and azimuthal angle dependence of the SFG spectra was observed from 0o to 360o with the step of 45o rotation around the surface normal. The 0° is defined as the [(Formula presented.)] direction of Si(111) crystal lying in the incident plane and opposite to the incident k vectors. The appearance of the NH mode was observed to be strongly dependent on the position. The results indicate that the distribution and orientation of APTES molecules were not well ordered on the Si surfaces, suggesting that SFG is an efficient method to check the quality of APTES coverage immobilized on substrates.

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More information

Accepted/In Press date: 10 August 2018
e-pub ahead of print date: 10 October 2018
Published date: January 2019
Keywords: APTES, polarization dependence, sum frequency generation, vibrational mode

Identifiers

Local EPrints ID: 425573
URI: https://eprints.soton.ac.uk/id/eprint/425573
ISSN: 0142-2421
PURE UUID: afcae4b1-a6bc-4320-978a-4b44754c2e17

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Date deposited: 25 Oct 2018 16:30
Last modified: 14 Jan 2019 17:30

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