Material Technologies for Mini- and Nanosensing
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1 Material Technologies for Mini- and Nanosensing Thierry Ferrus, Hitachi Cambridge Laboratory, UK Vladimir Privman, Clarkson University, USA Victor Ovchinnikov, Aalto University, Finland
2 Material concept Traditional or macromaterial bulk material, including bonded chemical elements, which are physically arranged (crystalline structure, amorphous ) Nanomaterial (metamaterial) nanoengineered classical material, including 1D and 2D materials. Problems with characterization! August 25, 2015 Panel "Material..." 2
3 Nanomaterials for sensors Nanoparticles: Metal based, including oxides Carbon based: fullerenes, buckyballs, CNT Semiconductor based: quantum dots Polymer based: dendrimers (branched polymers) Composite: nanoclays, DNA based biocomposite Core/shell nanoparticles Quantum dots Carbon nanotubes Inorganic nanowires Nanoporous materials Graphene: Electrochemical (potentiometric) sensor and biosensor (direct electron transfer) Gas sensor conductance Terahertz plasmonics and sensors 2D membrane. August 25, 2015 Panel "Material..." 3
4 Panel subtopics Electronic techniques for nano-sensing Thierry Ferrus Bio-Inspired Signal Processing Vladimir Privman SERS substrate as a nanoengineered surface Victor Ovchinnikov August 25, 2015 Panel "Material..." 4
5 SERS substrate as a nanoengineered surface Victor Ovchinnikov Aalto University, Finland
6 Steps of Raman development Laser application Dramatically improved power of excitation and Raman signal SERS effect (1974) Enhanced method sensitivity up to Raman microscope Decreased probe volume (light spot diameter below 1 Portable SERS Mobility of analyses C. Douketis et al., J. Chem. Phys. 2000, 113, August 25, 2015 Panel "Material..." 2
7 Electromagnetic enhancement in near-field Molecule Adenine on Ag nanoclusters Metal nanoparticle I L laser intensity Raman cross-section Laser excitation enhancement Scattered field enhancement K. Kneipp, Physic Tody, 60(11), 2007, p August 25, 2015 Panel "Material..." 3
8 Spectrum examples Polysterene beads Laser 785 nm Glass Laser 514 nm Laser 514 nm Bankapur A et all, (2010).PLoS ONE 5(4): e doi: /journal.pone Laboratoire de Sciences de la Terre ENS-Lyon Introduction to Raman Spectroscopy J. Raman Spectrosc. 2004; 35: August 25, 2015 Panel "Material..." 4
9 Portable Raman Stage Optical fiber RMP-300 Portable Raman Spectrometer August 25, 2015 Panel "Material..." 5
10 SERS substrate is nanoengineered surface! Simplest SERS substrate is Ag nanoparticle colloid, but its efficiency is low. Mass production of cheap SERS substrates is a problem! - Patterning - Metal dry etching - Adhesion sublayer 100 nm thick Au 200 nm holes August 25, 2015 Panel "Material..." 6
11 Leaning Si pillars M.S. Schmidt et al., Adv. Mater. 2012, 24, OP11 OP18 August 25, 2015 Panel "Material..." no leaning leaning 7
12 Commersial SERS substrate (Klarite) Very high enhancements are sacrificed in favor of homogeneity and reproducibility 785 nm E/E0 c-si ZHIDA XU, Master Thesis, University of Illinois at Urbana-Champaign, 2011 August 25, 2015 Panel "Material..." 8
13 Applications Chemical identification (bonds) Physical identification (crystallinity, phases, graphene) Stress and diameter measurements (carbon nanotubes) Trace analysis (explosives and drug detection) Process monitoring (in-situ measurements) Uncovering painting Biology (DNA) and medicine (glucose in-vivo) Pharmacology August 25, 2015 Panel "Material..." 9
14 IDEA 1: Can Bio-Inspired Signal Processing Steps Be Realized as Synthetic Biochemical Processes? (additional slides were shown for this topic, not reproduced here) Vladimir Privman Now: Modifications and networking of biochemical response for biosensor applications: Idea: Different paradigm of the input, X, vs. output, Y, signals(t) for incorporation of bioinspired concepts: as a function of ; reaction terms. See: V. Privman and E. Katz, Physica Status Solidi A 212, (2015) Here we had
15 IDEA 2: Mesoscale substrates and scaffolds for increasing complexity and for utilizing nanosize objects for (bio)sensing Vladimir Privman Now: Increasing the complexity of processing steps in biosensor applications (involving biomolecular and other chemical reactions), and other sensor applications (involving nanoparticles): Idea: Ultimately, for increased complexity and also to reduce environmental impact (for nanoparticles/nanoobjects), both biomolecules (e.g., enzymes) and nanoparticles will have to be immobilized and fuctionalized on various substrates or scaffolds. See comments on the next slide. Realized as a chemical soup
16 Comments for IDEA 2: substrates and scaffolds for increasing complexity and for utilizing nanosize objects for (bio)sensing Vladimir Privman (Bio)molecule (and, in fact, also nanoparticle/nanoobject) immobilization can involve complicated electrode surface structures and forms of (bio)chemical anchoring to accomplish charge transfer and (bio)chemical/catalytic activity, as well as longduration stability. Scaffolds for nanoparticles and other nanoobjects (and, in fact, also for biomolecules) can be mesoscopic and made from DNA, micro-fibers, various polymeric structures, combined structures (such as DNA origami wound around a conducting carbon nanotube), etc.
17 Electronic techniques for nano-sensing Thierry Ferrus Hitachi Cambridge Laboratory Panel on Material Technologies for mini- and Nano-sensing Hitachi, Ltd All rights reserved.
18 Outline Single Electron Transistors and Quantum Point Contacts Reflectometry measurements and dispersive measurements Measuring spin states Feedbacks action and weak measurements Hitachi, Ltd All rights reserved. 1
19 SETS and QPC Single electron transistor (2 barriers), QPC (1) Coulomb blockade, oscillations Capacitive detection, shifts Limited detection efficiency (2%) Improvement by : switching between current paths increasing confinement (E c ) Hitachi, Ltd All rights reserved. 2
20 Reflectometry and dispersive measurements Formation of a RLC circuit Resonance n 0 in the 100 MHz Measure of reflected signal at n n 0 (amplitude and phase) V g varies R and C Bandwidth ~ 8 MHz, higher than SET (C due to wires, except HEMT near devices) Problems : RF / mwave may disturb devices if sensitive to n Possible strong attenuation in presence of dopants, traps Hitachi, Ltd All rights reserved. 3
21 Spin measurements Difficulty in measuring spin directly Spin-to-charge conversion : Pauli blockade Singlet-triplet : Energy selection, tuned by E, Vg Hitachi, Ltd All rights reserved. 4
22 Feedback action and weak measurements Feedback action from detector to the device (state change) Depends on tunneling time (R), measurement time (C) Strong measurement on the detector but weak coupling Efficient measurement or repetitive measurements (bandwidth) Hitachi, Ltd All rights reserved. 5
23 END Electronic techniques for nano-sensing Thierry Ferrus Hitachi Cambridge Laboratory Hitachi, Ltd All rights reserved. 6
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