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Kenneth Knappenberger
Affiliate Researcher
Titles and Affiliations
Professor, Chemistry

In the News

Research Keywords

 These keywords and phrases come from the publications and other research output of this person. See other researchers related to these topics by clicking on any keyword.

Relaxation
Electronics
Photoluminescence
Relaxation Dynamics
Monolayers
Electronic Relaxation
Electronic Spectroscopy
Two-dimensional Electronic Spectroscopy
Nanoclusters
Nonlinear Optical
Spectroscopy
Nanomaterial
Electronic State
Absorption Spectroscopy
Au25
Plasmon
Optical Properties
Optical Property
Monolayer-protected Clusters
Nanoparticle

Projects

Abstract digital illustration of an atom, featuring glowing particles and swirling blue and white energy lines orbiting a bright central core, symbolizing atomic structure, electron spin, or quantum energy.
Development of Spin-Polarized Nano-Metal Catalysts

Recent Publications

Electronic Relaxation Dynamics of the Au42(SC8H9)32Cluster Nanorod Studied Using 2D Electronic Spectroscopy

Heintzelman, D. J., Smith, N. L., Miller, N. J., Luo, L., Jin, R. & Knappenberger, K. L., Jan 8 2026, In: Journal of Physical Chemistry Letters. 17, 1, p. 54-60 7 p.

Research output: Contribution to journal › Article › peer-review

Resolving State-Specific Energy Flow in Metal Nanoclusters Using 2D Electronic Spectroscopy

Heintzelman, D. J. & Knappenberger, K. L., Mar 19 2026, In: Journal of Physical Chemistry Letters. 17, 11, p. 3069-3075 7 p.

Research output: Contribution to journal › Review article › peer-review

Defect-Templated Phase Engineering in Atomically Thin Metals

Jain, A., Zheng, B., Datta, S., Ulman, K., Henz, J., Liu, M. W. J., Pham, V. D., He, W., Dong, C., Lu, L. S., Vera, A., Sawtarie, N., Auker, W., Wang, K., Hengstebeck, B., Henshaw, Z. W., Mathela, S., Wetherington, M., Blades, W. H. & Knappenberger, K. & 6 others, Wurstbauer, U., Quek, S. Y., Starke, U., Huang, S., Crespi, V. H. & Robinson, J. A., 2026, (Accepted/In press) In: Advanced Materials.

Research output: Contribution to journal › Article › peer-review

US must support chemistry research

Allen, K., Armentrout, P. B., Berkman, C., Boxer, S. G., Burkart, M., Canary, J. W., Castellano, R. K., Columbus, L., DeRose, V. J., Fairbrother, H., Ferguson, G. S., Foley, J., Haynes, C., Heemstra, J. M., Jaekle, F., Knappenberger, K., Kong, W., Kaufman, L. J., Lambert, T. H. & Lin, Y. S. & 16 others, Liu, H., Metz, R., Morris, A., Murphy, C. J., Peczuh, M., Pennington, W., Pojman, J. A., Reisman, S., Shores, M., Spokoyny, A. M., Szulczewski, G., Van Voorhis, T., Warren, T. H., Wang, L. S., Wysocki, V. & Zhang, J., Jun 19 2025, In: Science. 388, 6753, p. 1282-1283 2 p.

Research output: Contribution to journal › Letter › peer-review

Diverse Superatomic Magnetic and Spin Properties of Au144(SC8H9)60Clusters

Foxley, J., Tofanelli, M., Knappenberger, J. A., Ackerson, C. J. & Knappenberger, K. L., Aug 27 2025, In: ACS Central Science. 11, 8, p. 1329-1335 7 p.

Research output: Contribution to journal › Article › peer-review

Solvent Dependence of [Au11(BINAP)4X2: X = Cl or Br]+Cluster Electronic and Optical Properties

Heintzelman, D. J., Knappenberger, J. A. & Knappenberger, K. L., Jul 2025, In: Journal of Physical Chemistry A. 129, 29, p. 6638-6643 6 p.

Research output: Contribution to journal › Article › peer-review

Plasmon-mediated nonlinear optics and dynamics

Knappenberger, K. L., Kazuma, E., Martin, O. J. F. & Sheldon, M. T., Nov 7 2025, In: Journal of Chemical Physics. 163, 17, 170401.

Research output: Contribution to journal › Editorial › peer-review

Understanding Nanoparticle Electronic Spin-State Dynamics and Properties Using Variable-Temperature, Variable-Field Magnetic Circular Photoluminescence

Knappenberger, J. A. & Knappenberger, K. L., May 5 2025, In: ChemPhysChem. 26, 9, e202401139.

Research output: Contribution to journal › Review article › peer-review

Structure-Dependent Electronic Relaxation Dynamics of Two-Dimensional Silver Monolayers

Liu, M. W. J., Ulman, K. A., Zheng, B., Jain, A., Heintzelman, D. J., Wang, K., He, W., Dong, C., Lu, L. S., Crespi, V. H., Quek, S. Y., Robinson, J. A. & Knappenberger, K. L., Dec 10 2025, In: Nano letters. 25, 49, p. 17145-17151 7 p.

Research output: Contribution to journal › Article › peer-review

High Harmonic Generation from 2D Polar Metal Heterostructures

Ordonez, C., Dong, C., Jain, A., Lu, L. S., Robinson, J. A. & Knappenberger, K. L., Mar 13 2025, In: Journal of Physical Chemistry C. 129, 10, p. 5133-5139 7 p.

Research output: Contribution to journal › Article › peer-review

The Influence of Passivating Ligand Identity on Au25(SR)18 Spin-Polarized Emission

Smith, N. L., Herbert, P. J., Tofanelli, M. A., Knappenberger, J. A., Ackerson, C. J. & Knappenberger, K. L., May 22 2025, In: Journal of Physical Chemistry Letters. 16, 20, p. 5168-5172 5 p.

Research output: Contribution to journal › Article › peer-review

Influence of Halogen-Solvent Hydrogen Bonding on Gold Nanocluster Photoluminescence

Heintzelman, D. J., Nelson, S. A. & Knappenberger, K. L., Mar 21 2024, In: Journal of Physical Chemistry Letters. 15, 11, p. 2951-2956 6 p.

Research output: Contribution to journal › Article › peer-review

Thickness-dependent electronic relaxation dynamics in solution-phase redox-exfoliated MoS2 heterostructures

Jeffries, W. R., Jawaid, A. M., Vaia, R. A. & Knappenberger, K. L., Apr 14 2024, In: Journal of Chemical Physics. 160, 14, 144707.

Research output: Contribution to journal › Article › peer-review

Influence of Aliphatic versus Aromatic Ligand Passivation on Intersystem Crossing in Au25(SR)18-

Smith, N. L. & Knappenberger, K. L., Sep 12 2024, In: Journal of Physical Chemistry A. 128, 36, p. 7620-7627 8 p.

Research output: Contribution to journal › Article › peer-review

Resolving plasmon-mediated high-order multiphoton excitation pathways in dolmen nanostructures using ultrafast nonlinear optical interferometry

Zhao, T., Liu, X., Nepal, D., Park, K., Vaia, R., Nealey, P. & Knappenberger, K. L., Aug 7 2024, In: Journal of Chemical Physics. 161, 5, 054707.

Research output: Contribution to journal › Article › peer-review

Elsevier Pure Profile
IEE Research Themes
Integrated Energy Systems