TY  - GEN
A1  - Nguyen, Quyet Doan
A1  - Gerhard, Reimund
T1  - LDPE/MgO Nanocomposite Dielectrics for Electrical-Insulation and Ferroelectret-Transducer Applications
T2  - 2018 IEEE 2nd International Conference on Dielectrics (ICD)
N2  - Published results on LDPE/MgO nanocomposites (3wt%) show that they promise to be good electrical-insulation materials. In this work, the nanocomposites are examined as a potential (ferro-)electret material as well. Isothermal surface-potential decay measurements show that charged LDPE/MgO films still exhibit significant surface potentials after heating for 4 hours at 80 degrees C, which suggests good capabilities of LDPE/MgO nanocomposites to hold electric charges of both polarities. Open-tubular-channel ferroelectrets prepared from LDPE/MgO nanocomposite films show significant piezoelectricity with d(33) coefficients of about 20 pC/N after charging and are stable up to temperatures of at least 80 degrees C. Thus LDPE/MgO nanocomposites may become available as a new ferroelectret material. To increase their d(33) coefficients, it is desirable to optimize the charging conditions and the ferroelectret structure.
KW  - ferroelectrets
KW  - LDPE nanocomposites
KW  - electroacoustic probing
KW  - space-charge and polarization profiles
KW  - thermally stimulated discharge
Y1  - 2018
SN  - 978-1-5386-6389-9
SN  - 978-1-5386-6388-2
SN  - 978-1-5386-6390-5
PB  - IEEE
CY  - New York
ER  - 
TY  - GEN
A1  - Nguyen, Quyet Doan
A1  - Wang, Jingwen
A1  - Rychkov, Dmitry
A1  - Gerhard, Reimund
T1  - Depth Profile and Transport of Positive and Negative Charge in Surface (2-D) and Bulk (3-D) Nanocomposite Films
T2  - 2nd International Conference on Electrical Materials and Power Equipment (ICEMPE 2019)
N2  - In the present study, the charge distribution and the charge transport across the thickness of 2- and 3-dimensional polymer nanodielectrics was investigated. Chemically surface-treated polypropylene (PP) films and low-density polyethylene nanocomposite films with 3 wt % of magnesium oxide (LDPE/MgO) served as examples of 2-D and 3-D nanodielectrics, respectively. Surface charges were deposited onto the non-metallized surfaces of the one-side metallized polymer films and found to broaden and to thus enter the bulk of the films upon thermal stimulation at suitable elevated temperatures. The resulting space-charge profiles in the thickness direction were probed by means of Piezoelectrically-generated Pressure Steps (PPSs). It was observed that the chemical surface treatment of PP which led to the formation of nano-structures or the use of bulk nanoparticles from LDPE/MgO nanocomposites enhance charge trapping on or in the respective polymer films and also reduce charge transport inside the respective samples.
KW  - LDPE nanocomposites
KW  - MgO nanoparticles
KW  - Space charge
KW  - Charge transport
KW  - Charge stability
KW  - Acoustic probing of electric-field profiles
KW  - Piezoelectrically generated Pressure Steps (PPSs)
Y1  - 2019
SN  - 978-1-5386-8434-4
SN  - 978-1-5386-8435-1
U6  - https://doi.org/10.1109/ICEMPE.2019.8727256
SP  - 298
EP  - 300
PB  - IEEE
CY  - New York
ER  -