Liquid phase sensors based on chemically functionalized GaAs/AlGaAs heterostructures

S. M. Luber; K. Adlkofer; U. Rant; A. Ulman; A. Gölzhäuser; M. Grunze; D. Schuh; M. Tanaka; M. Tornow; G. Abstreiter

doi:10.1016/j.physe.2003.11.189

Liquid phase sensors based on chemically functionalized GaAs/AlGaAs heterostructures

S. M. Luber
, K. Adlkofer
, U. Rant
, A. Ulman
, A. Gölzhäuser
, M. Grunze
, D. Schuh
, M. Tanaka
, M. Tornow
, G. Abstreiter

Research output: Contribution to journal › Conference article › peer-review

33 Scopus citations

Abstract

We report on surface-near two-dimensional electron gases in GaAs/AlGaAs heterostructures for application in potential chemical or biochemical sensors in liquid environment. GaAs cap layers of the heterostructures were coated with self-assembled monolayers of 4′-substituted 4-mercaptobiphenyls (MBP), showing stable device performance in physiological (aqueous) buffers. Deposition of MBP with different 4′-substituents led to systematic changes in the lateral resistance, which can be correlated to the electrical potential drop across the established surface dipole layers. Furthermore, the lateral resistance showed a clear dependency on organic solvents with different polarities, suggesting its high sensitivity to the polarity of physisorbed molecules.

Original language	English
Pages (from-to)	1111-1115
Number of pages	5
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	21
Issue number	2-4
DOIs	https://doi.org/10.1016/j.physe.2003.11.189
State	Published - Mar 2004
Event	Proceedings of the Eleventh International Conference on Modulation (MSS11) - Nara, Japan Duration: 14 Jul 2003 → 18 Jul 2003

Keywords

GaAs
Heterostructure
Self-assembled monolayer
Sensor
Two-dimensional electron gas

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10.1016/j.physe.2003.11.189

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title = "Liquid phase sensors based on chemically functionalized GaAs/AlGaAs heterostructures",

abstract = "We report on surface-near two-dimensional electron gases in GaAs/AlGaAs heterostructures for application in potential chemical or biochemical sensors in liquid environment. GaAs cap layers of the heterostructures were coated with self-assembled monolayers of 4′-substituted 4-mercaptobiphenyls (MBP), showing stable device performance in physiological (aqueous) buffers. Deposition of MBP with different 4′-substituents led to systematic changes in the lateral resistance, which can be correlated to the electrical potential drop across the established surface dipole layers. Furthermore, the lateral resistance showed a clear dependency on organic solvents with different polarities, suggesting its high sensitivity to the polarity of physisorbed molecules.",

keywords = "GaAs, Heterostructure, Self-assembled monolayer, Sensor, Two-dimensional electron gas",

author = "Luber, \{S. M.\} and K. Adlkofer and U. Rant and A. Ulman and A. G{\"o}lzh{\"a}user and M. Grunze and D. Schuh and M. Tanaka and M. Tornow and G. Abstreiter",

year = "2004",

month = mar,

doi = "10.1016/j.physe.2003.11.189",

language = "English",

volume = "21",

pages = "1111--1115",

journal = "Physica E: Low-Dimensional Systems and Nanostructures",

issn = "1386-9477",

publisher = "Elsevier B.V.",

number = "2-4",

note = "Proceedings of the Eleventh International Conference on Modulation (MSS11) ; Conference date: 14-07-2003 Through 18-07-2003",

}

TY - JOUR

T1 - Liquid phase sensors based on chemically functionalized GaAs/AlGaAs heterostructures

AU - Luber, S. M.

AU - Adlkofer, K.

AU - Rant, U.

AU - Ulman, A.

AU - Gölzhäuser, A.

AU - Grunze, M.

AU - Schuh, D.

AU - Tanaka, M.

AU - Tornow, M.

AU - Abstreiter, G.

PY - 2004/3

Y1 - 2004/3

N2 - We report on surface-near two-dimensional electron gases in GaAs/AlGaAs heterostructures for application in potential chemical or biochemical sensors in liquid environment. GaAs cap layers of the heterostructures were coated with self-assembled monolayers of 4′-substituted 4-mercaptobiphenyls (MBP), showing stable device performance in physiological (aqueous) buffers. Deposition of MBP with different 4′-substituents led to systematic changes in the lateral resistance, which can be correlated to the electrical potential drop across the established surface dipole layers. Furthermore, the lateral resistance showed a clear dependency on organic solvents with different polarities, suggesting its high sensitivity to the polarity of physisorbed molecules.

AB - We report on surface-near two-dimensional electron gases in GaAs/AlGaAs heterostructures for application in potential chemical or biochemical sensors in liquid environment. GaAs cap layers of the heterostructures were coated with self-assembled monolayers of 4′-substituted 4-mercaptobiphenyls (MBP), showing stable device performance in physiological (aqueous) buffers. Deposition of MBP with different 4′-substituents led to systematic changes in the lateral resistance, which can be correlated to the electrical potential drop across the established surface dipole layers. Furthermore, the lateral resistance showed a clear dependency on organic solvents with different polarities, suggesting its high sensitivity to the polarity of physisorbed molecules.

KW - GaAs

KW - Heterostructure

KW - Self-assembled monolayer

KW - Sensor

KW - Two-dimensional electron gas

UR - https://www.scopus.com/pages/publications/12144288770

U2 - 10.1016/j.physe.2003.11.189

DO - 10.1016/j.physe.2003.11.189

M3 - Conference article

AN - SCOPUS:12144288770

SN - 1386-9477

VL - 21

SP - 1111

EP - 1115

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 2-4

T2 - Proceedings of the Eleventh International Conference on Modulation (MSS11)

Y2 - 14 July 2003 through 18 July 2003

ER -

Liquid phase sensors based on chemically functionalized GaAs/AlGaAs heterostructures

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Keywords

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