Recent Publications

2021

J.W. Yoo+, J. Jang+, U. Kim, Y. Lee, S. G. Ji, E. Noh, S. Hong, M. Choi*, S.I. Seok*, "Efficient perovskite solar mini-modules fabricated via bar-coating using 2-methoxyethanol-based formamidinium lead tri-iodide precursor solution", Joule, (2021)

J. Xi*+, J.S. Byeon+, U. Kim+, K. Bang+, G. R. Han, J.Y. Kim, J. Yoon, H. Dong, Z. Wu, G. Divitini, K. Xi, J. Park, T.W Lee, S. K. Kim, M. Choi, J. W. Lee*, "Abnormal spatial heterogeneity governing the charge-carrier mechanism in efficient Ruddlesden–Popper perovskite solar cells", Energy & Environmental Science, (2021)

W. Jung+, Y.-H. Jung+, P. V. Pikhitsa, J. Feng, Y. Yang, M. Kim, H.-Y. Tsai, T. Tanaka, J. Shin, K.-Y. Kim, H. Choi, J. Rho*, M. Choi*, "Three-dimensional nanoprinting via charged aerosol jets", Nature, (2021)​

S.H. Cho+, J. Byeon+, K. Jeong, J. Hwang, H. Lee, J. Jang, J. Lee, T. Kim, K. Kim, M. Choi*, Y.S. Lee*, "Investigation of Defect‐Tolerant Perovskite Solar Cells with Long‐Term Stability via Controlling the Self‐Doping Effect", Advanced Energy Materials, (2021)

J. Yoon+, U. Kim+, J. S. Choi+, M. Choi*, S. M. Kang*, "Bioinspired liquid-repelling sealing films for flexible perovskite solar cells", Materials Today Energy, (2021)​

J. Choi+, J. H. Yeon+, S. H. Yook, S. Shin, J. Y. Kim, M. Choi*, S. Jang*, "Multifunctional Nafion/CeO2 Dendritic Structures for Enhanced Durability and Performance of Polymer Electrolyte Membrane Fuel Cells", ACS Applied Materials & Interfaces, (2021)​

Y. W. Jang, S. Lee, K. M. Yeom, K. Jeong, K. Choi, M. Choi*, J. H. Noh*, "Intact 2D/3D halide junction perovskite solar cells via solid-phase in-plane growth", Nature Energy, (2021)​

2020

S. Jang, Y. S. Kang, J. Choi, J. H. Yeon, C. Seol, M. Choi, S. M. Kim, S. J. Yoo, "Prism patterned TiO2 layers/Nafion® composite membrane for elevated temperature/low relative humidity fuel cell operation", Journal of Industrial and Engineering Chemistry, (2020)​

C. Piao, J. Xi, M. Choi, "Directionally Selective Polyhalide Molecular Glue for Stable Inverted Perovskite Solar Cells", RRL Solar, (2020)​

J. Feng, D. Chen, P. V. Pikhitsa, Y.-H. Jung, J. Yang, M. Choi, "Unconventional Alloys Confined in Nanoparticles: Building Blocks for New Matter", Matter, (2020)​

J. Byeon, J. Kim, J.-Y. Kim, G. Lee, K. Bang, N. Ahn*, M. Choi*, "Charge Transport Layer-Dependent Electronic Band Bending in Perovskite Solar Cells and Its Correlation to Light-Induced Device Degradation", ACS Energy Letters, (2020)​

C. Lee, S. S. Shin, J. Choi, J. Kim, J.-W. Son, M. Choi, H. H. Shin, "A micro-patterned electrode/electrolyte interface fabricated by soft-lithography for facile oxygen reduction in solid oxide fuel cells", Journal of Materials Chemistry A, (2020)​

S. S. Shin, J. H. Kim, K. T. Bae, K.-T. Lee, S. M. Kim, J.-W. Son, M. Choi, H. Kim, "Multiscale structured low-temperature solid oxide fuel cells with 13 W power at 500 °C", Energy & Environmental Science, (2020)​

2019

 

J. H. Yeon, S. J. Park, I. Choi, M. Choi, "Generation of carbon nano-onions by laser irradiation of gaseous hydrocarbons for high durability catalyst support in proton exchange membrane fuel cells", Journal of Industrial and Engineering Chemistry, (2019)​

G. Lee, Y. W. Choi, T. Lee, K. S. Lim, J. Shin, T. Kim, H. K. Kim, B.-K. Koo, H. B. Kim, J.-G. Lee, K. Ahn, E. Lee, M. S. Lee, J. Jeon, H. S. Yang, P. Won, S. Mo, N. Kim, M. H. Jeong, Y. Roh, S. Han, J.-S. Koh, S. M. Kim, D. Kang, M. Choi, "Nature-inspired rollable electronics", NPG Asia Materials, (2019)​

G. Lee, M.-C. Kim, Y. W. Choi, N. Ahn, J. Jang, J. Yoon, S. M. Kim, J.-G. Lee, D. Kang, H. S. Jung, M. Choi, "Ultra-flexible perovskite solar cells with crumpling durability: toward a wearable power source", Energy & Environmental Science, (2019)​

S. Jang, J. Choi, M. Shin, J. H. Yeon, S. M. Kim, M. Choi, "Multiscale Hierarchical Patterning by Sacrificial Layer-Assisted Creep Lithography", Advanced Materials Interfaces, (2019)​

J. Xi, C. Piao, J. Byeon, J. Yoon, Z. Wu, M. Choi, "Rational Core-Shell Design of Open Air Low Temperature In Situ Processable CsPbI3 Quasi-Nanocrystals for Stabilized p-i-n Solar Cells", Advanced Energy Materials, (2019)​

K. Kwak, E. Lim, N. Ahn, J. Heo, K. Bang, S. K. Kim, M. Choi, "An atomistic mechanism for the degradation of perovskite solar cells by trapped charge", Nanoscale, (2019)​

M.-C. Kim, S. Jang, J. Choi, S. M. Kang, M. Choi, "Moth-eye Structured Polydimethylsiloxane Films for High-Efficiency Perovskite Solar Cells", Nano-Micro Letters, (2019)​

M.-C. Kim, N. Ahn, E. Lim, Y. U. Jin, P. V. Pikhitsa, J. Heo, S. K. Kim, H. S. Jung, M. Choi, "Degradation of CH3NH3PbI3 perovskite materials by localized charges and its polarity dependency", Journal of Materials Chemistry A, (2019)​
 

2018

 

Y. W. Choi, S. Jang, M. Chun, S. M. Kim, M. Choi, "Efficient Microfluidic Power Generator Based on Interaction between DI Water and Hydrophobic-Channel Surface", International Journal of Precision Engineering and Manufacturing-Green Technology (2018)

S. S. Shin, J. H. Kim, G. Li, S. Y. Lee, J.-W. Son, H. Kim*, M. Choi*, "A highly activated and integrated nanoscale interlayer of cathodes in low-temperature solid oxide fuel cells via precursor-solution electrospray method", International Journal of Hydrogen Energy, (2018)​

M. Park, W. Cho, G. Lee, S. C. Hong, M.-C. Kim, J. Yoon, N. Ahn, M. Choi, "Highly Reproducible Large-Area Perovskite Solar Cell Fabrication via Continuous Megasonic Spray Coating of CH3NH3PbI3", Small, (2018)

​N. Ahn, I. Jeon, J. Yoon, E. I. Kauppinen, Y. Matsuo, S. Maruyama, M. Choi, "Carbon-sandwiched perovskite solar cell", Journal of Materials Chemistry A, (2018)

J. S. Kang, J.-Y. Kim, J. Yoon, J. Kim, J. Yang, D. Y. Chung, M-c. Kim, H. Jeong, Y. J. Son, B. G. Kim, J. Jeong, T. Hyeon, M. Choi, M. J. Ko, Y.-E. Sung, "Room‐Temperature Vapor Deposition of Cobalt Nitride Nanofilms for Mesoscopic and Perovskite Solar Cells", Advanced Energy Materials, (2018)

 

S. Jang, S. Kim, S. M. Kim, J. Choi, J. Yeon, K. Bang, C.-Y. Ahn, W. Hwang, M. Her, Y.-H. Cho, Y.-E. Sung, M. Choi, "Interface engineering for high-performance direct methanol fuel cells using multiscale patterned membranes and guided metal cracked layers", Nano Energy, (2018)

 

2017

 

D. G. Lee, M.-C. Kim, B. J. Kim, D. H. Kim, S. M. Lee, M. Choi, S. Lee, H. S. Jung, "Effect of TiO2 particle size and layer thickness on mesoscopic perovskite solar cells", Applied Surface Science, (2017)

 

J. H. Kim, S. S. Shin, H. S. Noh, J.-W. Son, M. Choi, H. Kim, "Tailoring ceramic membrane structures of solid oxide fuel cells via polymer-assisted electrospray deposition", Journal of Membrane Science, (2017)

 

S. Jang, S. M. Kang, M. Choi, "Multifunctional Moth-eye TiO2/PDMS Pads with High Transmittance and UV Filtering", ACS Applied Materials & Interfaces, (2017)

 

D. Lee, K. Lee, D. S. Kim, J.-K. Lee, S. J. Park, M. Choi, "Hydrogen-assisted spark discharge generation of highly crystalline and surface-passivated silicon nanoparticles", Journal of Aerosol Science, (2017)

 

K. Lee, H. Choi, D. S. Kim, M. S. Jang, M. Choi, "Vertical stacking of three-dimensional nanostructures via an aerosol lithography for advanced optical applications", Nanotechnology, (2017)

 

G. Lee, T. Lee, Y. W. Choi, P. V. Pikhitsa, S. J. Park, S. M. Kim, D. Kang, M. Choi, "Metal-elastomer bilayered switches by utilizing the superexponential behavior of crack widening", 

 

J. S. Yoo, G. S. Han, S. Lee, M.-C. Kim, M. Choi, H. S. Jung, J.-K. Lee, "Dual function of a high-contrast hydrophobic-hydrophilic coating for enhanced stability of perovskite solar cells in extremely humid environments", Nano Research, (2017)

 

I. Jeon, J. Yoon, N. Ahn, M. Atwa, C. Delacou, A. Anisimov, E. I. Kauppinen, M. Choi, S. Maruyama, Y. Matsuo, "Carbon Nanotubes versus Graphene as Flexible Transparent Electrodes in Inverted Perovskite Solar Cells", Journal of Physical Chemistry Letters, (2017)

 

S. Kim, S. Jang, S. M. Kim, C.-Y. Ahn, W. Hwang, Y.-H. Cho, Y.-E. Sung, M. Choi, "Reduction of methanol crossover by thin cracked metal barriers at the interface between membrane and electrode in direct methanol fuel cells", Journal of Power Sources, (2017)

 

S. Kang, W. Jung, D. S. Kim, S. J. Park, M. Choi, "Assembly of charged aerosols on non-conducting substrates via ion-assisted aerosol lithography (IAAL)", Particuology, (2017)

 

T. Lee, Y. W. Choi, G. Lee, S. M. Kim, D. Kang,  M. Choi, "Crack-based strain sensor with diverse metal films by inserting an inter-layer", RSC Advances, (2017)

 

T. Park, Y. S. Kang, S. Jang, S. W. Cha, M. Choi, S. J. Yoo, "A rollable ultra-light polymer electrolyte membrane fuel cell", NPG Asia Materials, (2017)

 

Y. S. Kang, T. Park, S. Jang, M. Choi, S. J. Yoo, S. W. Cha, "Repetitive bending test of membrane electrode assembly for bendable polymer electrolyte membrane fuel cell", Journal of Industrial and Engineering Chemistry, (2017)

 

S. C. Hong, G. Lee, K. Ha, J. Yoon, N. Ahn, W. Cho, M. Park, M. Choi, "Precise Morphology Control and Continuous Fabrication of Perovskite Solar Cells Using Droplet-Controllable Electrospray Coating System", ACS Applied Materials & Interfaces, (2017)

 

Y. W. Choi, D. Kang, P. V. Pikhitsa, T. Lee, S. M. Kim, G. Lee, D. Tahk, M. Choi, "Ultra-sensitive Pressure sensor based on guided straight mechanical cracks", Scientific Reports, (2017)

 

J. Yoon, H. Sung, G. Lee, W. Cho, N. Ahn, H. S. Jung, M. Choi, "Superflexible, high-efficiency perovskite solar cells utilizing graphene electrodes: towards future foldable power sources", Energy & Environmental Science, (2017)

 

S. Chae, H. Lee, P. V. Pikhitsa, C. Kim, S. Shin, D. H. Kim, M. Choi, "Synthesis of terraced and spherical MgO nanoparticles using flame metal combustion", Powder Technology, (2017)

 

Y. Bae, P. V. Pikhitsa, H. Cho, M. Choi, "Multifurcation Assembly of Charged Aerosols and Its Application to 3D Structured Gas Sensors", Advanced materials, (2017)

 

S. R. Noh, D. Lee, S. J. Park, D. S. Kim, M. Choi, "High throughput nanoparticle generation utilizing high-frequency spark discharges via rapid spark plasma removal", Aerosol Science and Technology, (2017)

 

P. V. Pikhitsa, S. Chae, S. Shin, M. Choi. "A Low-Field Temperature Dependent EPR Signal in Terraced MgO: Mn2+ Nanoparticles: An Enhanced Zeeman Splitting in the Wide-Bandgap Oxide", Journal of Spectroscopy, (2017)

 

2016

 

T. Lee, Y. W. Choi, G. Lee, P. V. Pikhitsa, D. Kang, S. M. Kim, M. Choi, "Transparent ITO mechanical crack-based pressure and strain sensor", Journal of Materials Chemistry C, (2016)

 

W. Kim, P. V. Pikhitsa, Mansoo Choi, "Particle size selection in post-spark dusty plasma in non-uniform electric field", Applied Physics Letters, (2016)

 

S. R. Noh, D. S. Kim, S. J. Park, M. Choi, "Enhanced yield yield of positively charged particles from a spark discharge generator via in situ corona discharges", Journal of Aerosol Science, (2016)

 

M.-C. Kim, B. J. Kim, D.-Y. Son, N.-G. Park, H. S. Jung, M. Choi, "Observation of Enhanced Hole Extraction in Br Concentration Gradient Perovskite Materials", Nano Letters, (2016)

 

S. M. Kim, Y. S. Kang, C. Ahn, S. Jang, M. Kim, Y.-E. Sung, S. J. Yoo, M. Choi, "Prism-patterned Nafion membrane for enhanced water transport in polymer electrolyte membrane fuel cell", Journal of Power Sources, (2016)

S. M. Kim, C.-Y. Ahn, Yong-Hun Cho, S. Kim, W. Hwang, S. Jang, S. Shin, G. Lee, Y.-E Sung, M. Choi, "High-performance Fuel Cell with Stretched Catalyst-Coated Membrane: One-step Formation of Cracked Electrode", Scientific Reports, (2016)

 

N. Y. Ahn+, K. Kwak+, M. S. Jang, H. Yoon, B. Y. Lee, J.-K. Lee, P. V. Pikhitsa, J. Byun, M. Choi, "Trapped charge-driven degradation of perovskite solar cells", Nature communications, (2016)

 

S. Jang, J. S. Kang, J. -K. Lee, S. M. kim, Y. J. Son, A. Lim, H. Cho, J. Kim, J. Jeong, G. Lee, Y. -E. Sung, M. Choi, "Enhanced Light Harvesting in Mesoscopic Solar Cells by Multilevel Multiscale Patterned Photoelectrodes with Superpositioned Optical Properties", Advanced Functional Materials, (2016)

 

H. Yoon, S. M. Kang, J.-K. Lee, M. Choi, "Hysteresis-free low-temperatures-processed planar perovskite solar cells with 19.1% effiiciency", Energy & Environmental Science, (2016)

 

S. M. Kang, S. Jang, J.-K. Lee, J. Yoon, J.-W. Lee, D.-E. Yoo, M. Choi, N.-G. Park, "Moth-Eye TiO2 Layer for Improving Light Harvesting Efficiency in Perovskite Solar Cells", Small, (2016)

 

S. Jang, M. Kim, Y. S. Kang, Y. W. Choi, S. M. Kim, Y.-E. Sung, M. Choi, "Facile Multiscale Patterning by Creep-Assisted Sequential Imprinting and Fuel Cell Application, ACS Applied Materials & Interfaces, (2016)

 

S. Jang, J. Yoon, K. Ha, M.-C. Kim, D. H. Kim, S. M. Kim, S. M. Kang, S. J. Park, H. S. Jung, M. Choi, "Facile fabrication of three-dimensional TiO2 structures for highly efficient provskite solar cells", Nano Energy, (2016)

 

H. Sung, N. Ahn, M. S. Jang, J.-K. Lee, H. Yoon, N.-G. Park, M. Choi, "Transparent Conductive Oxide-Free Graphene-Based Perovskite Solar Cells with over 17% Efficiency", Advanced Energy Materials, (2016)

 

K. Ha, E. Jang, S. Jang, J.-K. Lee, M. S. Jang, H. Choi, J.-S. Cho, M. Choi, "A light-trapping strategy for nanocrystalline silicon thin-film solar cells using three-dimensionally assembled nanoparticle structures", Nanotechnology, (2016)

 

 

2015

 

M.-C. Kim, B. J. Kim, J. Yoon, J.-W. Lee, D. Suh, N.-G. Park, M. Choi, H. S. Jung, "Electro-spray deposition of a mesoporous TiO2 charge collection layer toward large scale and continuous production of high efficiency perovskite solar cells", Nanoscale, (2015)

 

H.-S. Kim, I.-K. Jang, N. Ahn, M. Choi, A. Guerrero, J. Bisquert, N.-G. Park, "Control of I-V Hysteresis in CH3NH3PbI3 perovskite Solar Cell", Journal of Physical Chemistry Letters, (2015)

 

N. Ahn, S. M. Kang, J.-W. Lee, M. Choi, N.-G. Park, "Thermodynamic regulation of CH3NH3PbI3 crystal growth and its effect on photovoltaic performance of perovskite solar cells", Journal of Materials Chemistry A, (2015)

 

S. Y, Lim, Y.-R. Kim, K. Ha, J.-K. Lee, J. G. Lee, W. Jang, J.-Y. Lee, J. H. Bae and T. D. Chung " Light-guided electrodeposition of non-noble catalyst patterns for photoelectrochemical hydrogen evolution", Energy & Environmental Science, (2015)

 

S. Kang, J.-E. Kim D. Kim, C. G. Woo, Peter V. Pikhitsa, M.-H.Cho and M. Choi "Comparison of celluar toxicity between multi-walled carbon nanotubes and onion-like shell-shaped carbon nanoparticles", Journal of nanoparticle research, (2015)

 

H. Cho, S. M. Kim, Y. S. Kang, J. Kim, S. Jang, M. Kim, H. Park, J. W. Bang, S. Seo, K.-Y. Suh, Y.-E. Sung and M. Choi “Multiplex lithography for multilevel multiscale architectures and its application to polymer electrolyte membrane fuel cell”, Nature Communications, (2015)

 

N. Ahn, S. M. Kang, J.-W. Lee, M. Choi and N.-G. Park. “Thermodynamic regulation of CH 3 NH 3 PbI 3 crystal growth and its effect on photovoltaic performance of perovskite solar cells”, Journal of Materials Chemistry A, (2015)

 

J. -K. Lee, H. Sung, M. S. Jang, H. Yoon,  and M. Choi, “Reliable doping and carrier concentration control in graphene by aerosol-derived metal nanoparticles”, Journal of Materials Chemistry C, (2015)

 

N. Ahn, D.-Y. Son, I.-H. Jang, S. M. Kang M. Choi and N.-G. Park, “Highly Reproducible Perovskite Solar Cells with Average Efficiency of 18.3% and Best Efficiency of 19.7% Fabricated via Lewis Base Adduct of Lead(II) Iodide”, Journal of the American Chemical Society, (2015)

 

H. Choi, S. Kang, W. Jung, Y.-H. Jung, S. J. Park, D. S. Kim, and M. Choi. “Controlled electrostatic focusing of charged aerosol nanoparticles via an electrified mask”, Journal of Aerosol Science, (2015)

 

Peter V. Pikhitsa, C. Kim, S. Chae, S. Shin, S. Jung, M. Kitaura, S.-i. Kimura, K. Fukui, and M. Choi. “Two-band luminescence from an intrinsic defect in spherical and terraced MgO nanoparticles”, Applied Physics Letters, (2015)

 

S. Chae, D. Lee, M.-C. Kim,D. S. Kim, and M. Choi, “Wire-in-Hole-Type Spark Discharge Generator for Long-Time Consistent Generation of Unagglomerated Nanoparticles”, Aerosol Science and Technology, (2015)

 

 

2014

 

D.Kang, Peter V.Pikhitsa, Y.W.Choi, C.Lee, S.S.Shin, Linfeng Piao, B.Park, K.Y.Suh, T.I.Kim and M.Choi, “Ultrasensitive mechanical crack-based sensor inspired by the spider sensory system”, Nature, (2014)

 

C.Lee, S.M.Kim, Y.J.Kim, Y.W.Choi, K.Y.Suh, C.Pang and M.Choi, “Robust Microzip Fastener: Repeatable Interlocking Using Polymeric Rectangular Parallelepiped Arrays”, ACS applied materials&interfaces, (2014)

 

S.M.Kang, N.Ahn, J.W.Lee, M.Choi and N.G.Park, “Water-repellent perovskite solar cell”, Journal of Materials Chemistry A, (2014)

 

K. Jung, J. Hahn, S. In, Y. Bae, H. Lee, Peter V.Pikhista, K.Ahn, K. Ha, J.K.Lee, N.Park and M.Choi, “Hot-spots Engineered 3D Multipetal Flower Assemblies for Surface-Enhanced Raman Spectroscopy”, Advanced Materials, (2014)

 

K. Ha, H.Choi, K.Jung, K.Han, J.K.Lee, K.Ahn and M.Choi, “Large-Area Assembly of Three-Dimensional Nanoparticle Structures via Ion Assisted Aerosol Lithography with a Multi-pin Spark Discharge Generator”, Nanotechnology, (2014)

 

K. Jung, H. Song, G. Lee, Y. Ko, K. Ahn, H. Choi, J.Y Kim, K. Ha, J. Song, J. Lee, C. Lee and M. Choi, “Plasmonic Organic Solar Cells Employing Nanobump Assembly via Aerosol-Derived Nanoparticles”, ACS Nano 8, 2590-2601, (2014)

 

H. Sung, J. Lee, K. Han, J. Lee, J. Sung, D. Kim and M. Choi, C. Kim, “Controlled positioning of metal nanoparticles in an organic light-emitting device for enhanced quantum efficiency”, Organic Electronics 15, 491-499, (2014)

 

J. Kim, S. Kang, Y. Moon, J. Chae, A. Y. Lee, J. Lee, K. Yu, D. H. Jeong, M. Choi and M. Cho, “Physicochemical Determinants of Multiwalled Carbon Nanotubes on Cellular Toxicity: Influence of a Synthetic Method and Post-treatment”, Chemical Research in Toxicology 27, 290-303, (2014)

 

H. Cho, J. Kim, H. Park, J. Bang, M. S. Hyun, Y. Bae, L. Ha, D. Y. Kim, S. M. Kang, T. J. Park, S. Seo, M. Choi and K. Suh, “Replication of flexible polymer membranes with geometry-controllable nano-apertures via a hierarchical mould-based dewetting”, Nature Communications 5, 3137- , (2014)

 

 

2013

 

J. Jung, K. Ha, J. Cho, S. Ahn, H. Park, S. Q. Hussain, M. Choi and J. Yi, “Enhancing Light Trapping Properties of Thin Film Solar Cells by Plasmonic Effect of Silver Nanoparticles”, Journal of Nanoscience and Nanotechnology, Vol. 13, 7860-7864, (2013)

 

H. Sung and M. Choi, “Assembly of Nanoparticles: Towards Multiscale Three-Dimensional Architecturing”, KONA Powder and Particle Journal 30, 31-46, (2013)

 

 

2012

 

K. Lim, J-R Lee, H. Lee, P. V. Pikhitsa, S. You, C. G. Woo, P. Kim, K. Y. Suh and M. Choi, “Nanoxerography utilizing bipolar charge patterns”, Applied Physics Letters 101, pp.203106 (2012)

 

A. Yu. Ilyushechkin, I. E. Agranovskii, I. S. Altman, V. A. Zagainov and M. Choi , “Influence of magnesium oxide nanoparticles embedded in Bi-2212/Ag tapes on their superconducting properties”, Technical Physics 55, 506-511 (2012)

 

S. Sheen, S. Yang, K. Jun, P. V. Pikhitsa and M. Choi, “Crystallinity Control of Flame Generated Composite Nanoparticles by Laser Irradiation”, Powder Technology 229, 246-252 (2012)

 

K. Han, W. Kim, J. Yu, J. Lee, H. Lee, C. G. Woo and M. Choi, “A Study of pin-to-plate type spark discharge generator for producing unagglomerated nanoaerosols”, Journal of Aerosol Science 52, 80-88 (2012)