NSUF - Nuclear Science User Facilities

Joshua Pak

Profile Information
Name
Dr. Joshua Pak
Institution
Idaho State University
Position
Professor and Chair
Affiliation
American Chemical Society
h-Index
ORCID
0000-0001-5476-3685
Biography

Dr. Pak earned his Ph.D. in Chemistry from University of Oregon in 1999 and was a postdoctoral associate at UC Irvine until 2001. Dr. Pak began his independent career at Idaho State University in 2001 and is currently a full-professor and a chair. His research interests cover wide range of materials chemistry from nanomaterials to polymers. Dr. Pak's research projects have been funded by various federal and private organizations including DOE, NSF, ACS, and Murdock Foundation. Dr. Pak is also interested in providing research experiences to underrepresented groups in STEM by involving students in his research projects from the high school to postdocs. He also visits school classrooms, public libraries and museums providing STEM outreach activities.

Expertise
Inorganic Chemistry, Organic Chemistry, Photovoltaic, Polymers, Quantum Dots, Radiation Chemistry
Additional Publications:
"Synthesis and Characterization of Bimetallic Single‐Source Precursors (Ph3P)2M(µ‐SEt)2E(SEt)2 for MES2 Chalcopyrite Materials (M = Cu, Ag and E = In, Ga, Al)" Chivin Sun, Matthew T. Kihara, Adam C. Colson, Lev N. Zakharov, Kenton H. Whitmire, Andrew W. Holland, Joshua J. Pak, Kelsey R. Margulieux, [2017] European Journal of Inorganic Chemistry · DOI: 10.1002/ejic.201700115

We report the synthesis and characterization of I–III bimetallic complexes (Ph3P)2M(µ‐SEt)2E(SEt)2(M = Cu, Ag and E = In, Ga, Al), as well as (Ph3P)2M(µ‐Cl)2ECl2complexes isolated during their syntheses. The thiolate complexes can be used as single‐source precursors (SSPs) to prepare various I–III chalcogenide semiconductor materials. The preparation of some SSPs of the series required minor variation in the reaction conditions. The organometallic complexes were structurally characterized by X‐ray diffraction. The SSPs are compared in terms of their solid‐state structures, basic reactivity, and potential suitability as precursors for chalcopyrite materials.
"A large-scale synthesis and characterization of quaternary CuIn xGa 1-xS 2 chalcopyrite nanoparticles via microwave batch reactions" Richard D. Westover, Gary Long, Cyril Bajracharya, Jerry D. Harris, Alex Punnoose, Rene G. Rodriguez, Joshua J. Pak, Chivin Sun, [2011] International Journal of Chemical Engineering · DOI: 10.1155/2011/545234

Various quaternary CuInxGa1−xS2 (0 ≤ x ≤ 1) chalcopyrite nanoparticles have been prepared from molecular single‐source precursors via microwave decomposition. We were able to control the nanoparticle size, phase, stoichiometry, and solubility. Depending on the choice of surface modifiers used, we were able to tune the solubility of the resulting nanoparticles. This method has been used to generate up to 5 g of nanoparticles and up to 150 g from multiple batch reactions with excellent reproducibility. Data from UV‐Vis, photoluminescence, X‐ray diffraction, TEM, DSC/TGA‐MS, and ICP‐OES analyses have shown high reproducibility in nanoparticle size, composition, and bandgap.
"Controlled stoichiometry for quaternary CuIn xGa 1-x S 2 chalcopyrite nanoparticles from single-source precursors via microwave irradiation" Joseph S. Gardner, Gary Long, Cyril Bajracharya, Aaron Thurber, Alex Punnoose, Rene G. Rodriguez, Joshua J. Pak, Chivin Sun, [2010] Chemistry of Materials · DOI: 10.1021/cm100456t
"Divergent Syntheses of Copper-Indium Bimetallic Single-Source Precursors via Thiolate Ligand Exchange" Richard D. Westover, Kelsey R. Margulieux, Lev N. Zakharov, Andrew W. Holland, Joshua J. Pak, Chivin Sun, [2010] Inorganic Chemistry · DOI: 10.1021/ic1006692
"Stepwise introduction of thiolates in copper-indium binuclear complexes" Chivin Sun, Lev N. Zakharov, Andrew W. Holland, Joshua J. Pak, Kelsey R. Margulieux, [2010] Inorganic Chemistry · DOI: 10.1021/ic9025602
"Extraction of technetium as [TC(II)(NO)(AHA)2H 2O]+ species in the UREX+ process" [2009] International Conference on Nuclear Engineering, Proceedings, ICONE · EID: 2-s2.0-77952919254
"Resorcinarenes and aza-crowns as new extractants for the separation of technetium-99" [2009] Materials Research Society Symposium Proceedings · EID: 2-s2.0-70449449203
"Rapid synthesis and size control of CuInS2 semi-conductor nanoparticles using microwave irradiation" Endrit Shurdha, Chongmin Wang, Lisa D. Lau, René G. Rodriguez, Joshua J. Pak, Joseph S. Gardner, [2008] Journal of Nanoparticle Research · DOI: 10.1007/s11051-007-9294-7
"An efficient synthesis of 4,4′,5,5′-tetraiododibenzo-24-crown-8 and its highly conjugated derivatives" Jaime L. Mayo, Endrit Shurdha, Joshua J. Pak, [2006] Tetrahedron Letters · DOI: 10.1016/j.tetlet.2005.10.147
"Pulsed-spray radiofrequency plasma enhanced chemical vapor deposition of CuInS 2 thin films" Daniel J. V. Pulsipher, Lisa D. Lau, Endrit Shurdha, Joshua J. Pak, Michael H. Jin, Kublinder K. Banger, Aloysius F. Hepp, Rene G. Rodriguez, [2006] Plasma Chemistry and Plasma Processing · DOI: 10.1007/s11090-006-9018-2
"Preparation and study of highly conjugated pyridine and bipyridine derivatives and their metal complexes" [2005] ACS National Meeting Book of Abstracts · EID: 2-s2.0-22744442726
"Synthesis and crystallographic characterization of a 'palladadehydrobenzo[19]annulene'" Ossama S. Darwish, Timothy J.R. Weakley, Michael M. Haley, Joshua J. Pak, [2003] Journal of Organometallic Chemistry · DOI: 10.1016/s0022-328x(03)00707-1
"Diastereoselective self-assembly of a pentacoordinate siliconate tetraanionic molecular square. A mechanistic investigation" John Greaves, Dianne J. McCord, K. J. Shea, Joshua J. Pak, [2002] Organometallics · DOI: 10.1021/om020263x
"Synthesis and characterization of annulene-fused pseudorotaxanes" [2002] Synthesis · EID: 2-s2.0-0036317821
"Nonlinear optical properties of dehydrobenzo[18]annulenes: Expanded two-dimensional dipolar and octupolar NLO chromophores" Joshua J. Pak, George W. Rayfield, Michael M. Haley, Abhijit Sarkar, [2001] Journal of Materials Chemistry · DOI: 10.1039/b107182n
"Synthesis of expanded graphdiyne substructures" [2000] Chemistry - A European Journal · EID: 2-s2.0-0034595649
"Stepwise assembly of site specifically functionalized dehydrobenzo [18] annulenes" Timothy J. R. Weakley, Michael M. Haley, Joshua J. Pak, [1999] Journal of the American Chemical Society · DOI: 10.1021/ja991749g
"Carbon networks based on dehydrobenzoannulenes: Synthesis of graphdiyne substructures" [1997] Angewandte Chemie - International Edition in English · EID: 2-s2.0-0031007781
"One-pot desilylation/dimerization of ethynyl- and butadiynyltrimethylsilanes. Synthesis of tetrayne-linked dehydrobenzoannulenes" Michael L Bell, Stephen C Brand, David B Kimball, Joshua J Pak, W.Brad Wan, Michael M Haley, [1997] Tetrahedron Letters · DOI: 10.1016/s0040-4039(97)01796-6
"Synthesis and crystallographic characterization of a platinadehydrobenzo[19]annulene" [1997] Organometallics · EID: 2-s2.0-0000664979
"α,β-Unsaturated nitriles: An efficient conjugate addition with potassium benzeneselenolate and potassium benzenesulfenylate" [1995] Journal of Organic Chemistry · EID: 2-s2.0-0001228083
Source: ORCID/CrossRef using DOI

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The Nuclear Science User Facilities (NSUF) is the U.S. Department of Energy Office of Nuclear Energy's only designated nuclear energy user facility. Through peer-reviewed proposal processes, the NSUF provides researchers access to neutron, ion, and gamma irradiations, post-irradiation examination and beamline capabilities at Idaho National Laboratory and a diverse mix of university, national laboratory and industry partner institutions.

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