Correlative characterizations of structure and properties of ZnO/cellulose nanocrystal hybrids

https://doi.org/10.4224/40001310

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Correlative characterizations of structure and properties of

ZnO/cellulose nanocrystal hybrids

Correlative Characterization of Structure

and Properties of ZnO/Cellulose Nanocrystal

Hybrids

Hui (Julie) Qian, Ken Bosnick, Melissa Lehner

Nanotechnology Research Center, NRC, Edmonton, AB

Acknowledgements

Mike Xia

Steve Launspach

Jennifer Bruce

Bradley Smith

Background

Food Loss& Waste Problems

CEC. 2017. Characterization and Management of Food Loss

and Waste in North America. Montreal, Canada: Commission

for Environmental Cooperation. 48 pp.

Renewable, Smart Packaging

Blending CNC nanorods with the renewable-derived

packaging only adds passive reinforcement.

Renewable

• Derived from biomass

• Needs reinforcement

• Passive packaging

Interested in multifunctional, smart, renewable

packaging solutions.

Add smart functionality to CNC particles by

synthesizing designer hybrids with active materials.

Degenerately doped ZnO nanoparticles for optical

sensing of biogenic amines -> smart, renewable

packaging that can sense meat spoilage.

Smart

• Responsive to stimuli

• Multi-functional

Nanostructured ZnO

ZnO Nanorod Chemiresistive Sensing

K

Bosnick et al, “Meat Spoilage Sensing Devices”, Advanced

Materials. Vol. 3 Biotech, Biomaterials and Biomedical, pp. 12-15

,

2018.

Cellulose Nanocrystals

Surface chemistry of cellulose nanoparticles

How to Combine ZnO and CNCs?

CNCs coated or decorated with ZnO

ZnO in the matrix of CNCs

1)

2)

Importance of Characterization of

ZnO/CNCs Hybrids

• To confirm:

 Morphology& structure - incorporate to composites or smart device

 Thermal stability

– packaging

 or other property

• To provide feedback to optimize synthesis including drying approaches

• Analysis approaches:

 SEM, TEM/STEM, SEAD, EELS, XRD etc.

 Raman Scattering, FTIR, TGA, UV-Vis, PL etc.

1) ZnO NPs within CNCs Matrix

2) CNCs@ZnO Hybrids in TEM/STEM

SAED

3) CNC@ZnO Hybrids in TEM/STEM

XRD

– CNCs/ZnO

New phase?

Hybrids

Thermal Stability

- Thermal Gravimetric Analysis

N

gas, 10°C/min

Before the mass loss, is the structure changed due to heating?

Drying methods

affecting thermal

stability measurement

Thermal Stability

- in situ TEM Heating (CNCs)

CNCs@RT

_CNCs@250°C

STEM ADF

Heat to desired T

-hold for 10-15mins

-cool down to RT

-imaging & analysis

Minimize electron

beam induced

damage

C-K, O-K Near Edge Fine Structure of CNCs

after Heating

C-K edge

O-K edge

Raman Spectroscopy

- crystallinity ( ex-situ heating of CNCs)

Thermo Scientific DXR2 Raman microscope,

785nm laser, 30mW power, 10x objective

“380 Raman peak”

Thermal Stability

- in situ TEM heating (CNCs@ZnO)

Summary

 Synthesis of CNCs@ZnO hybrids

 Correlative characterizations of hybrids including morphology and

structure using EM & XRD

 Thermal stability - Heating influence on the structure of CNCs

More to be done or answer:

 Heating effect on CNCs/ZnO, -> optimize the synthesis

 Response to biogenic amines

THANK YOU