@misc{NguyenGerhard2018,
  author    = {Nguyen, Quyet Doan and Gerhard, Reimund},
  title     = {LDPE/MgO Nanocomposite Dielectrics for Electrical-Insulation and Ferroelectret-Transducer Applications},
  series = {2018 IEEE 2nd International Conference on Dielectrics (ICD)},
  journal   = {2018 IEEE 2nd International Conference on Dielectrics (ICD)},
  publisher = {IEEE},
  address   = {New York},
  isbn      = {978-1-5386-6389-9},
  pages     = {4},
  year      = {2018},
  abstract  = {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.},
  language  = {en}
}
@misc{NguyenWangRychkovetal.2019,
  author    = {Nguyen, Quyet Doan and Wang, Jingwen and Rychkov, Dmitry and Gerhard, Reimund},
  title     = {Depth Profile and Transport of Positive and Negative Charge in Surface (2-D) and Bulk (3-D) Nanocomposite Films},
  series = {2nd International Conference on Electrical Materials and Power Equipment (ICEMPE 2019)},
  journal   = {2nd International Conference on Electrical Materials and Power Equipment (ICEMPE 2019)},
  publisher = {IEEE},
  address   = {New York},
  isbn      = {978-1-5386-8434-4},
  doi       = {10.1109/ICEMPE.2019.8727256},
  pages     = {298 -- 300},
  year      = {2019},
  abstract  = {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.},
  language  = {en}
}