NanoMaterials: 0D (Dots) and 1D (nanoRods) Synthesis, Properties and Processing - PowerPoint PPT Presentation

1 / 34
About This Presentation
Title:

NanoMaterials: 0D (Dots) and 1D (nanoRods) Synthesis, Properties and Processing

Description:

NanoMaterials: 0D (Dots) and 1D (nanoRods) Synthesis, Properties and Processing Quantum Dot systems Control metal/semiconducting properties by size control – PowerPoint PPT presentation

Number of Views:2096
Avg rating:3.0/5.0
Slides: 35
Provided by: KevinJar
Category:

less

Transcript and Presenter's Notes

Title: NanoMaterials: 0D (Dots) and 1D (nanoRods) Synthesis, Properties and Processing


1
NanoMaterials 0D (Dots) and 1D
(nanoRods)Synthesis, Properties and Processing
  • Quantum Dot systems
  • Control metal/semiconducting properties by size
    control
  • Control charge transfer and material properties
    through ligand caps
  • Biomimetic routs to assembly
  • nanoRods
  • produce wide variety of semiconducting, metalic
    and magnetic rods
  • actuation strategies thermal, magnetic, electric
  • Biomimetic Actuation
  • Processing to device setting and fibers

2
Quantum Dot Materials/Sensors
BROAD GOAL SELF-ASSEMBLY OF METAL AND
SEMICONDUCTOR QUANTUM DOTS INTO A LIGHT ACTIVATED
NANOBATTERY USED, FOR EXAMPLE, TO REMOTELY
ACTUATE A MEMS DEVICE
MEMS
h?
LIGHT ACTIVATED NANOBATTERY SELF-ASSEMBLED
ENERGY STORAGE MEDIUM ELECTRONICALLY
CONDUCTIVE POLYMER OF FUNCTIONALIZED
SEMICONDUCTOR AND METAL QUANTUM DOTS

REDOX SEMI- SOLID

POLYMER OF METAL QDS
POLYMER OF SEMICOND QDS
lt1 ?m
STUDY DIFFERENT CHEMICAL MODES OF ORGANIZING
NANOPARTICLES FILM SELF-ASSEMBLY DNA NANOWIRE
SELF-ASSEMBLY CONTROL FUNCTIONALIZATION OF
SEMICONDUCTOR QDS SELF-ASSEMBLE INTO
FILMS STUDY ELECTRON HOPPING DYNAMICS BETWEEN
THE QDS INVESTIGATE PHOTOELECTROCHEMICAL
REACTIONS
Murray (UNC)
3
A METAL QUANTUM DOT THAT DISPLAYS MOLECULAR
PROPERTIES
USE LIGAND EXCHANGE TO SELF-ASSEMBLE DIMERS,
TRIMERS, FILMS OF THIS AND OTHER QDS
PULSE VOLTAMMETRY
ECHEM BAND GAP 1.65V
PEG-SH
LIGAND EXCHANGE
Au38 (PEG)24
Au38(PhC2)24
UV-VIS SPECTRA
HS-BRIDGE-SH
ON-GOING EXPTS FOR QD FILMS
OR CdSe QD WITH CONTROLLED MONOLAYER SHELL
Murray (UNC)
JACS 2003, 125, 1182
1.6 eV OPTICAL BANDGAP
4
DNA ORGANIZATION OF QUANTUM DOTS
TEM IMAGE OF DNA Au3000(SC11N(CH3)3)910
ELECTROSTATIC INTERACTION GOVERNED BY ENTROPY
CHANGE. NANOPARTICLE CHAIN IS ORGANIZED IN
SOLUTION AND CAST ON SURFACE.
BLACK DOTS SHOWN REPRESENT 4.4 NM Au
NANOPARTICLES. DNA IS INVISIBLE UNDER TEM WITHOUT
STAINING OR COATING.
EDGE-EDGE SPACING OF NANOPARTICLES IS 2.9 NM,
COMPARABLE WITH LIGANDS LENGTH ? 2
THIS SCHEME CAN BE EMPLOYED WITH CATIONIC QUANTUM
DOTS OF METALS AND SEMI CONDUCTORS TO OBTAIN ONE
DIMENSIONAL NANOPARTICLE ASSEMBLY.
Murray (UNC)
Gangli Wang and Royce W. Murray May, 2003
5
NanoRod materials as Sensor and Actuators
  • Actuation strategies
  • Thermal, Electrical (Piezo), Magnetic
  • Sensing Nanomaterial Oscillators

Applications
Active Surfaces in Aerodynamics
Microfluidics
Mass Sensing
6
NanoRod materials as Sensor and Actuators
  • Actuation strategies
  • Thermal, Electrical (Piezo), Magnetic
  • Sensing Nanomaterial Oscillators

Applications
Active Surfaces in Aerodynamics
Microfluidics
Mass Sensing
7
Synthesis nanoRods
2-200 nm
Whatman membrane Anodisc
disks, sheets, on-chip
  • 1. Sol-gel ? High-T oxidation ? dissolve
    template ? harvest nanotubes
  • Semiconductor oxides
  • PZT piezoelectric
  • Carbon mesotubes (CMTs)
  • 2. Electrochemical deposition of metallic and
    magnetic nanorods
  • 3. Sol-gel in bulk solution.

8
Semiconductor oxide nanotubes
Ga2O3
Cheng Samulski J. Mater. Chem. 11, 2901 (2001).
Samulski, UNC
9
Lead Zirconate Titanate (PZT)
B. Cheng ETS
Piezoelectric PZT nanotubes
Samulski (UNC) Evaluation Z. Ounaies (USRA)
10
Polyacrylonitrile CNTs
SEM image of PAN nanofibers after pyrolysis at
700 C for 6 hrs.
SEM image of PAN nanofibers after Polymerization
and cyclization (at 220 C for10 hrs).
Samulski (UNC)
11
Selenium Solution basedPolycrystalline Powder
to Single Crystal Nanowires
  • High piezoelectric, thermoelectric,
    photoconductivity and nonlinear optical
    responses
  • High reactivity to many chemicals (easily convert
    Se into other functional compounds, such as ZnSe,
    CdSe, Bi2Se3, Ag2Se, etc.)

Samulski, UNC
12
Zinc Oxide nanorods Solution process
  • Sol Gel bulk solution process
  • High Purity
  • High efficiency

500 nm
500 nm
100 nm
100 nm
Samulski, UNC
13
Zinc Oxide nanorods (HRTEM)
  • Long fibersZnO nanorods as ideal 1-D
    reinforcements?
  • Piezoelectric Actuation and Sensing
  • Photoluminescent optical devices?

Samulski, UNC
14
Zinc Oxide nanorods (photoluminescence)
Cast film emission ? Very high purity rivaling
ZnO prepared by CVD
Samulski, UNC
15
Zinc Oxide nanorods (photoluminescence)
variety of sizes and images
Brightfield
light-guiding? Next-correlated AFM/OM
Luminescence
Samulski, Superfine UNC
16
Actuation Strategies
  • Thermal Carbon Nanotube Bimaterial Strips
  • Magnetic Permalloy nanorods

Superfine, UNC
  • Electrical PiezoElectric PZT and Se Nanorods

Samulski (UNC), Ounaies (USRA), Aksay (Princeton)
17
Thermal Actuating Carbon Nanotube Bilayers
  • Study individual tubes ? thermal sensing
    materials
  • Carbon has near zero thermal exp. coeff.
  • Deposited metals on nanotubes Al best

The Good Al
The Bad Cr
The Ugly Thick Al
Superfine, UNC
18
Thermal Actuating Carbon Nanotube Bilayers
  • Deposited metals on nanotubes Al best

T200 C
T20 C
T20 C
Superfine, UNC
19
The Human Lung Exquisite Active Surface
  • Actuators Cilia beat 15 HZ, 2 micron stroke
  • Sensors Cilia measure mucus volume/rheology

Real Cilia UNC Human Lung Cell Cultures
Superfine, UNC
20
Biomimetic Actuation Magnetic Structures
  • Inspiration Cilia as Biological Actuators

Biomimetic
Biology
Silia PDMSmagnetic colloids
Polycarbonate Membrane
AFM tip
Silia Probed with SEM/AFM integrated system
Real Cilia UNC Human Lung Cell Cultures
Superfine, UNC
21
Magnetic nanorods and flux control system
  • Magnetic nanorods for use in composites and as
    probes
  • Flexible 6 coil flux-control system with
    microfabricated pole plates for actuation of
    microsystems (patent pending)

6 Coil Ring
200nm diameter Permalloy nanorods electroplated
into AAO membranes
Photolithography Pole Plates-Tips 20 mm
Superfine, UNC
22
NiFe alloy nanorods from nanopore electroplating
  • AAO Membranes, coat one side with metal layer
  • Electroplate NiFe, obtain 200nm, 15 micron rods
  • EDX measures composition as NiFe

Superfine, UNC
23
Biomimetic Actuation from Cilia to Silia
live human lung cell cultures
Superfine, UNC
24
Biomimetic Actuation from Cilia to Silia
live human lung cell cultures
individual NiFe nanorod .2x10mm cilia
Superfine, UNC
25
Biomimetic Actuation from Cilia to Silia
live human lung cell cultures
individual NiFe nanorod .2x10mm cilia
Superfine, UNC
26
Biomimetic Actuation from Cilia to Silia
sheets of nanorod Silia
live human lung cell cultures
individual NiFe nanorod .2x10mm cilia
27
Biomimetic Actuation from Cilia to Silia
sheets of nanorod Silia
live human lung cell cultures
individual NiFe nanorod .2x10mm cilia
Biology
Silia
28
Piezoelectric Materials for Sensors
PZT Microcantilevers as sensors and embedded
microwhiskers in polyimide
Piezoelectric Polyimide
Carbeck, Dabbs, Aksay (Princeton)
29
Theoretical Experimental Analysis
Carbeck, Dabbs, Aksay (Princeton)
30
Miniaturized Pb(Zr0.52Ti0.48)O3 Cantilevers
  • Additive patterning of Pb(Zr0.52Ti0.48)O3 (PZT)
    sol-gels via soft lithography
  • Incorporation of micropatterned ferroelectric
    layers into MEMS

Carbeck, Dabbs, Aksay (Princeton)
31
Enhancing Sensitivity via Nanostructured Coatings
Coated Cantilever
L3
L3
Cubic
Xerogel
Water vapor adsorption
Carbeck, Dabbs, Aksay (Princeton)
32
Assembly of functional nanostructured materials
GOAL development of self and guided assembly
methods for fabrication of
functional nanostructured materials and devices
Project 1 wiring electric circuits by CNTs via
self and guided assembly
Proposed approach
Preliminary data
O. Zhou, Samulski (UNC)
33
CNT/CNT composite fibers by dielectrophoresis
Development of a liquid-phase process for
parallel fabrication of nanometer-diameter CNT
and other nanotubes as probes , fibrils and
investigation of their physical properties
Preliminary result uniform 100nm diameter CNT
fiber with L 1 mm to 1cm
Proposed approach
Publication J. Tang et al. Adv. Mater. in press
Zhou, Forest, Rubinstein (UNC), Park (NIA)
34
Summary Sensors and Actuation
  • We have a marketplace of
  • 0 D (Quantum Dot) Atomic control, Molecular
    functionalization
  • 1 D (Nanotube, Nanorod) materials metallic,
    semi, magnetic
  • Biomimetic Strategies
  • extract biological principles, fundamental
    knowledge, applications
  • Structure (DNA assembled QD)
  • Actuation (Cilia ? Silia)
  • Processing strategies for nanomaterials ? devices
Write a Comment
User Comments (0)
About PowerShow.com