Title: NanoMaterials: 0D (Dots) and 1D (nanoRods) Synthesis, Properties and Processing
1NanoMaterials 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
2Quantum 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)
3A 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
4DNA 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
5NanoRod materials as Sensor and Actuators
- Actuation strategies
- Thermal, Electrical (Piezo), Magnetic
- Sensing Nanomaterial Oscillators
Applications
Active Surfaces in Aerodynamics
Microfluidics
Mass Sensing
6NanoRod materials as Sensor and Actuators
- Actuation strategies
- Thermal, Electrical (Piezo), Magnetic
- Sensing Nanomaterial Oscillators
Applications
Active Surfaces in Aerodynamics
Microfluidics
Mass Sensing
7Synthesis 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.
8Semiconductor 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)
10Polyacrylonitrile 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)
11Selenium 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
12Zinc Oxide nanorods Solution process
- Sol Gel bulk solution process
- High Purity
- High efficiency
500 nm
500 nm
100 nm
100 nm
Samulski, UNC
13Zinc Oxide nanorods (HRTEM)
- Long fibersZnO nanorods as ideal 1-D
reinforcements? - Piezoelectric Actuation and Sensing
- Photoluminescent optical devices?
Samulski, UNC
14Zinc Oxide nanorods (photoluminescence)
Cast film emission ? Very high purity rivaling
ZnO prepared by CVD
Samulski, UNC
15Zinc Oxide nanorods (photoluminescence)
variety of sizes and images
Brightfield
light-guiding? Next-correlated AFM/OM
Luminescence
Samulski, Superfine UNC
16Actuation Strategies
- Thermal Carbon Nanotube Bimaterial Strips
- Magnetic Permalloy nanorods
Superfine, UNC
- Electrical PiezoElectric PZT and Se Nanorods
Samulski (UNC), Ounaies (USRA), Aksay (Princeton)
17Thermal 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
18Thermal Actuating Carbon Nanotube Bilayers
- Deposited metals on nanotubes Al best
T200 C
T20 C
T20 C
Superfine, UNC
19The 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
20Biomimetic 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
21Magnetic 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
22NiFe 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
23Biomimetic Actuation from Cilia to Silia
live human lung cell cultures
Superfine, UNC
24Biomimetic Actuation from Cilia to Silia
live human lung cell cultures
individual NiFe nanorod .2x10mm cilia
Superfine, UNC
25Biomimetic Actuation from Cilia to Silia
live human lung cell cultures
individual NiFe nanorod .2x10mm cilia
Superfine, UNC
26Biomimetic Actuation from Cilia to Silia
sheets of nanorod Silia
live human lung cell cultures
individual NiFe nanorod .2x10mm cilia
27Biomimetic Actuation from Cilia to Silia
sheets of nanorod Silia
live human lung cell cultures
individual NiFe nanorod .2x10mm cilia
Biology
Silia
28Piezoelectric Materials for Sensors
PZT Microcantilevers as sensors and embedded
microwhiskers in polyimide
Piezoelectric Polyimide
Carbeck, Dabbs, Aksay (Princeton)
29Theoretical Experimental Analysis
Carbeck, Dabbs, Aksay (Princeton)
30Miniaturized 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)
31Enhancing Sensitivity via Nanostructured Coatings
Coated Cantilever
L3
L3
Cubic
Xerogel
Water vapor adsorption
Carbeck, Dabbs, Aksay (Princeton)
32Assembly 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)
33CNT/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)
34Summary 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