WO2004046690A2 - Composite sensor membrane - Google Patents

Composite sensor membrane Download PDF

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Publication number
WO2004046690A2
WO2004046690A2 PCT/US2003/036890 US0336890W WO2004046690A2 WO 2004046690 A2 WO2004046690 A2 WO 2004046690A2 US 0336890 W US0336890 W US 0336890W WO 2004046690 A2 WO2004046690 A2 WO 2004046690A2
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WO
WIPO (PCT)
Prior art keywords
membrane
layer
deflection
sensor
substrate
Prior art date
Application number
PCT/US2003/036890
Other languages
English (en)
French (fr)
Other versions
WO2004046690A3 (en
Inventor
Arun Majumdar
Srinath Satyanarayana
Min Yue
Original Assignee
The Regents Of The University Of California
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Regents Of The University Of California filed Critical The Regents Of The University Of California
Priority to EP03786818A priority Critical patent/EP1563286A4/en
Priority to AU2003295620A priority patent/AU2003295620A1/en
Priority to JP2004570625A priority patent/JP2006507511A/ja
Publication of WO2004046690A2 publication Critical patent/WO2004046690A2/en
Publication of WO2004046690A3 publication Critical patent/WO2004046690A3/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G01N33/54366—Apparatus specially adapted for solid-phase testing
    • G01N33/54373—Apparatus specially adapted for solid-phase testing involving physiochemical end-point determination, e.g. wave-guides, FETS, gratings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31681—Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31692—Next to addition polymer from unsaturated monomers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31721—Of polyimide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers

Definitions

  • TECHNICAL FIELD [0003] This disclosure relates to sensors such as physical, chemical, and biological sensors.
  • Micro-electromechanical (MEMS) sensors may use microcantilevers to sense physical, chemical, and biological interactions.
  • a microcantilever is a structure that is fixed at one end and free at the other.
  • MEMS fabricated microcantilevers may be fabricated using silicon-based materials.
  • microcantilever sensors may be used to sense biomolecular interactions as follows.
  • a surface of a microcantilever may be functionalized with a particular probe molecule, where the probe molecule interacts with the target molecule.
  • a probe molecule For example, in order to detect particular DNA material, a short single-stranded DNA (ssDNA) sequence may be used as a probe molecule for a complimentary ssDNA.
  • ssDNA short single-stranded DNA
  • an appropriate antibody may be used as a probe molecule.
  • FIGS. 1A and IB illustrate biological sensing using a microcantilever. Referring to FIG.
  • a cantilever 100 is fixed at a first end 110 to a substrate 190, and free to move at a second end 120.
  • a region 130 of the cantilever includes one or more probe molecules 140 for sensing target molecules.
  • FIG. 1A shows the cantilever in its undeflected state.
  • a target molecule 150 may interact with one or more of probe molecules 140, changing the surface stress of cantilever 100 and causing cantilever 100 to bend.
  • the amount by which cantilever 100 bends generally depends on the number of target molecules 150 interacting with probe molecules 140, and may therefore provide a measure of the concentration of target molecules 150.
  • the deflection of the cantilever may be detected using, for example, optical or piezoresistive detection techniques.
  • a sensor may include a membrane to deflect in response to a change in surface stress.
  • a layer on the membrane may be provided to couple one or more probe molecules with the membrane.
  • the membrane may deflect when a target molecule reacts with one or more probe molecules.
  • the membrane may be fixed to a substrate at a first portion and a second different portion, and may span a well in the substrate.
  • the membrane may include a flexible material, such as a polymer. Polymers such as polyimide and parylene, or other polymers may be used.
  • the layer may include a material to couple probe molecules to the membrane.
  • the layer may include gold.
  • the layer may cover a portion of a first side of the membrane. The portion may be between about 5% and about 90%, or between about 10% and about 70%.
  • a system may include a substrate and one or more membranes coupled with the substrate.
  • the system may include a membrane spanning a well, where the membrane may have a layer to couple probe molecules to the membrane.
  • the system may also include another membrane spanning another well, where the another membrane has a layer to couple probe molecules with the membrane.
  • the system may include a cover to enclose the well and the another well.
  • the system may include channels to provide fluid to the membranes.
  • a method may include introducing fluid into a region proximate to a membrane, the fluid including one or more target molecules to be sensed. At least some of the target molecules may interact with the probe molecules and cause the membrane to deflect.
  • the method may include measuring the deflection of the membrane. The deflection may be measured using optical detection methods and/or electrical detection methods.
  • FIGS. 1A and IB show a cantilever in the undeflected and deflected positions.
  • FIGS 2A and 2B show different implementations of membranes that may be used.
  • FIG. 3 illustrates measuring membrane deflection using optical beam deflection.
  • FIG. 4A shows a Fabry-Perot interferometry apparatus .
  • FIG. 4B shows a Michelson interferometry apparatus .
  • FIG. 5 shows a membrane spanning a well in a substrate .
  • FIGS. 6A to 6E illustrate fabrication of a membrane structure such as that shown in FIG. 5.
  • FIGS. 7A and 7B show top and side views of a system including multiple sensors.
  • FIGS. 8A and 8B show a cross section of a membrane with a gold layer and a cross section of an equivalent gold membrane.
  • FIGS. 9A to 9D illustrate deflection of a membrane .
  • FIG. 10 shows out of plane deflection of a membrane as a function of membrane length and percentage of gold layer coverage.
  • Membranes may be fabricated using materials with lower elasticity moduli than silicon-based materials that are generally used to fabricate micro-cantilevers. For example, some metal, ceramic, polymer, or other materials may be used. The elasticity moduli of these materials may be appreciably less than the moduli of materials usually used to fabricate micro-cantilevers. For example, parylene has an elasticity modulus of about 3.2 GPa, while silicon nitride (a common cantilever material) has an elasticity module of about 110 GPa, a difference of almost two orders of magnitude.
  • the membrane material may also be chosen to be compatible with the expected operating environment of the sensor.
  • bio-compatible membrane materials such as Parylene
  • appropriately compatible materials may be chosen for chemical or physical sensing.
  • a sensor 200 includes a membrane 210.
  • Membrane 210 may be fixed to a substrate 230 to produce a deflection of membrane 210 due to a change in surface stress that reflects the change in surface stress.
  • membrane 210 may be rectangular, as shown in FIGS. 2A and 2B. Referring to FIG. 2A, membrane 210 may be fixed to substrate 230 at a first side 232, a second side 234, a third side 236, and a fourth side 238. Referring to FIG. 2B, membrane 210 may be fixed to substrate 230 only at first side 232 and second side 234. [0030] Membrane 210 may have a region 240 that is modified physically, chemically, or biologically. For example, region 240 may be functionalized with one or more probe molecules for sensing one or more target molecules. Region 240 may include an intermediate layer such as a gold layer, a silicon dioxide layer, or other layer to couple probe molecules with the membrane. Using an appropriate intermediate layer, probe molecules may be coupled with the membrane surface via, for example, an intermediate thiol or cysteamine group. In some implementations, an intermediate layer may not be necessary.
  • Membrane 210 may act as a chemical sensor when region 240 is configured to experience a change in surface stress in response to a chemical reaction.
  • region 240 may include a thin oxide or polymer coating.
  • membrane 210 may comprise a metal such as gold or palladium to sense materials including, for example, hydrogen or mercury.
  • a net change in the surface stress on one side of membrane 210 results in an out of plane deflection of the membrane.
  • the resulting deflection or rotation of the flexible membrane can be measured using optical techniques, piezoelectric techniques, piezoresistive techniques, or other techniques.
  • Optical techniques include interferometry or optical beam deflection.
  • optical beam deflection may be used to detect membrane deflection.
  • Light is provided by a laser 370, and reflected off a surface 315 of a membrane 310.
  • the reflected light is sensed using a detector 380, such as a charge-coupled device (CCD) detector or photosensor array detector (e.g., a CMOS array detector) .
  • CCD charge-coupled device
  • photosensor array detector e.g., a CMOS array detector
  • a reference surface 450 reflects light from a laser 470, which is received in a detector 480.
  • a sensor surface 415 of a membrane 410 also reflects the light from laser 470, which is also received in detector 480.
  • a first interference pattern is produced when the membrane is undeflected. As membrane 410 deflects, the interference pattern shifts. The changes in the interference pattern may be used to determine the magnitude of deflection of membrane 410.
  • a reference surface 450 of a glass plate 455 reflects light from laser 470 towards detector 480.
  • Sensor surface 415 also reflects light from laser 470 towards detector 480, producing an interference pattern.
  • the interference pattern may be used to determine the height h by which membrane 410 is deflected from its equilibrium position.
  • a Michelson interferometry apparatus receives light from a laser 470 via a beam splitter 475, and reflects the light towards detector 480.
  • Surface 415 of membrane 410 also receives light via beam splitter 475 and reflects the light towards detector 480.
  • An interference pattern is produced, which may be used to determine the height h by which membrane 410 is deflected from its equilibrium position.
  • Silicon materials may provide less than optimum deflection due to their high elasticity modulus. Polymers such as parylene, polyimide, etc., may provide a better choice.
  • a membrane 510 (for example, a parylene membrane) is fixed to a substrate 500 at a first end 512 and a second end 514.
  • a well 520 in substrate 500 allows membrane 510 to deflect.
  • the membrane will be exposed to the fluid. Subsequently, target molecules that bind with the probe molecules on the surface of membrane 510 cause membrane 510 to deflect.
  • a layer 530 is provided on a surface region of membrane 510.
  • layer 530 may be a gold layer that is compatible with thiol chemistry for attaching probe molecules to the surface of membrane 510.
  • Other layer materials may be used; for example, layer 530 may be a silicon dioxide layer.
  • FIGS. 6A through 6E show process steps that may be used to fabricate a sensor comprising a membrane with an intermediate layer to couple one or more probe molecules to the membrane.
  • a cross-sectional view and a top view are provided in each of FIGS. 6A through 6E .
  • a substrate 600 such as a silicon substrate is provided.
  • a layer of a membrane material 610 such as parylene is formed on substrate 600.
  • a parylene layer may be formed on substrate 600 using a room temperature chemical vapor deposition (CVD) technique.
  • layer 610 is patterned to define a membrane structure 615 bounded by substrate regions 605.
  • photolithography may be used to pattern a photoresist layer on layer 610, then the pattern may be transferred to layer 610 using an oxygen plasma etch.
  • a layer 620 of a material e.g., gold
  • substrate material is etched from regions 605 to form an open space beneath membrane structure 615.
  • an isotropic etch that is selective of silicon with respect to parylene may be used to form the open space.
  • a dry plasma etch or a wet etch may be used.
  • membrane structure 615 is not separate from the rest of layer 610; rather the membrane structure 615 refers to the portion of layer bridging the open space and fixed to the substrate proximate to the well.
  • FIGS. 7A and 7B a system for performing biological sensing with multiple sensors is shown. Referring to FIG.
  • a first sensor 710A and a second sensor 710B may be formed in a substrate 700 as described above and shown in FIGS. 6A through 6E.
  • a cover 730 which may be fabricated from glass or other material, couples with substrate 700 to form regions 760A and 760B.
  • First sensor 710A and second sensor 710B may deflect in regions 760A and 760B.
  • Fluid may be provided to and/or removed from regions proximate to sensors 710A and 710B using channels (not shown) that may be formed, for example, in substrate 700 or in cover 730. Fluid may be provided to sensors 710A and 710B for functionalization; that is, to provide probe molecules for detecting target molecules. First sensor 710A and second sensor 710B may be functionalized to detect different target molecules, or to detect the same target molecules. Alternately, at least one of first sensor 710A and second sensor 710B may be used for common mode rejection, and may not be functionalized. [0047] For common mode rejection, the deflection of a reference sensor may be monitored. The deflection of the reference sensor may change over time due to, for example, a drift in temperature. Since the same drift may be occurring in other sensors proximate to the reference sensor and introducing noise into the measurements, the change in deflection of the reference sensor may be used to subtract noise from the other sensors .
  • Fluid may be provided to sensors 710A and/or 710B to determine whether the fluid (i.e., gas or liquid) includes one or more target molecules .
  • the same fluid may be provided to sensors 710A and 710B, or different fluids may be provided.
  • Table 1 below includes a list of parameters used in the analysis below.
  • Equation (1) The y-coordinates of the topmost (y + ) and bottommost (y ⁇ ) fibers of the composite membrane with respect to the neutral axis are given by Equations (2) and (3).
  • the strain at the top fiber is given by Equation (4), while the surface energy per unit length due to the change in surface stress is given by Equation (5) .
  • Equation (6) The elastic strain energy of the membrane due to bending per unit length of the membrane is given by Equation (6) .
  • the width of the membrane as a function of y is given in Equations (7A) and (7B) .
  • the curvature K is obtained by minimizing the total energy of the system, given in Equation (8), as shown in Equation (9).
  • the vertical deformation of the center of the membrane is evaluated using energy minimization and superposition methods.
  • a membrane 910 is fixed to a substrate 900 at either end.
  • Membrane 910 has a gold layer 920 formed symmetrically about an axis 940 through the middle of membrane 910.
  • FIG. 9B to determine the net vertical deformation, the vertical deformation due to surface stress change is determined, where the deformation of the center of the membrane with respect to the end is given by Equation (10) below, and the angle at the free end is given by Equation (11).
  • Equation (12) The deformation of the center of the membrane with moment M being the only load is given by Equation (12), and the corresponding angle at the free end is given by Equation (13) .
  • FIG. 10 is a plot of the out of plane deflection of a membrane with the parameters given in Table 2 as a function of membrane length and the percentage of gold coverage. For shorter membranes, the maximum deflection is obtained with a lower percentage of the membrane covered by a gold layer than for longer membranes. For a membrane length of about 600 ⁇ m with 65% gold coverage, the deflection is about 20 nm, assuming a surface stress change of about 1 mJ/ 2 . This deflection may be measured using the optical detection techniques described above. [0077] A number of implementations have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the invention. For example, different materials may be used for the membrane. Different layer materials may be provided on the membrane. Further different methods for providing probe molecules may also be used.
  • membranes have been shown, other shapes may be used.
  • circular membranes may be used.
  • the shape of the membrane need not be regular or symmetric; a membrane shape that deflects in response to a change in surface stress may be used.
  • the placement of a layer on the membrane need not be symmetric.
  • the membrane may be attached to the one or more support structures (e.g., the substrate) differently than shown. Accordingly, other embodiments are within the scope of the following claims.
PCT/US2003/036890 2002-11-15 2003-11-17 Composite sensor membrane WO2004046690A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP03786818A EP1563286A4 (en) 2002-11-15 2003-11-17 COMPOSED SENSOR MEMBRANE
AU2003295620A AU2003295620A1 (en) 2002-11-15 2003-11-17 Composite sensor membrane
JP2004570625A JP2006507511A (ja) 2002-11-15 2003-11-17 複合センサメンブレン

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US42685102P 2002-11-15 2002-11-15
US60/426,851 2002-11-15
US10/420,661 US7344678B2 (en) 2002-11-15 2003-04-21 Composite sensor membrane
US10/420,661 2003-04-21

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WO2004046690A2 true WO2004046690A2 (en) 2004-06-03
WO2004046690A3 WO2004046690A3 (en) 2004-10-21

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EP (1) EP1563286A4 (US20040096357A1-20040520-M00006.png)
JP (1) JP2006507511A (US20040096357A1-20040520-M00006.png)
AU (1) AU2003295620A1 (US20040096357A1-20040520-M00006.png)
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US20040096357A1 (en) 2004-05-20
US20080278731A1 (en) 2008-11-13
WO2004046690A3 (en) 2004-10-21
US7344678B2 (en) 2008-03-18
JP2006507511A (ja) 2006-03-02
EP1563286A4 (en) 2007-09-19

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