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Bhusari, DM, Yang JR, Wang TY, Chen KH, Chen LC.  1998.  Novel Two Stage Method for Growth of Highly Transparent Nano-crystalline Diamond Films. Mater. Lett.. 36:279.
Chen, YC, Lin YG, Hsu YK, Yen SC, Chen KH, Chen LC.  2014.  Novel iron oxyhydroxide lepidocrocite nanosheet as ultrahigh power density anode material for asymmetric supercapacitors. Small . 10:3803–3810.
Lin, YG, Hsu YK, Chen SY, Chen KH, Chen LC.  2008.  Novel copper-zinc oxide arrayed nanoatalysts for hydrogen production applications. ECS Transactions. 13:165-168.
Wang, B-Y, Wang HT, Chen L-Y, Hsueh HC, Chiou JW, Wang W-H, Wang PH, Chen K-H, Chen Y-C, Chen L-C, Chen C-H, Pong WF, Wang J, Guo J-H.  2016.  Nonlinear opening of the band gap of BN-co-doped graphene. Carbon.
Chen, KH, Wang J, Mazur E.  1987.  Non-thermal Intramolecular Vibrational Energy Distribution in Infrared-multiphoton-excited CF2Cl2. Phys. Rev. Lett. 59:2728.
Dhara, SK, Magudapathy P, Kesavamoorthy R, Kalavathi S, Nair KGM, Hsu GM, Chen LC, Chen* KH, Santhakumar K, Soga T.  2006.  Nitrogen ion beam synthesis of InN in InP(100) at elevated temperature. Appl. Phys. Lett.. 88:241904-(1-3).
Billo, T, Fu F-Y, Raghunath P, Shown I, Chen W-F, Lien H-T, Shen T-H, Lee J-F, Chan T-S, Huang K-Y, Wu C-I, Lin MC, Hwang J-S, Lee C-H, Chen L-C, Chen K-H.  2018.  Ni-Nanocluster Modified Black TiO2 with Dual Active Sites for Selective Photocatalytic CO2 Reduction. Small. 14:1702928–n/a., Number 2 AbstractWebsite

One of the key challenges in artificial photosynthesis is to design a photocatalyst that can bind and activate the CO2 molecule with the smallest possible activation energy and produce selective hydrocarbon products. In this contribution, a combined experimental and computational study on Ni-nanocluster loaded black TiO2 (Ni/TiO2[Vo]) with built-in dual active sites for selective photocatalytic CO2 conversion is reported. The findings reveal that the synergistic effects of deliberately induced Ni nanoclusters and oxygen vacancies provide (1) energetically stable CO2 binding sites with the lowest activation energy (0.08 eV), (2) highly reactive sites, (3) a fast electron transfer pathway, and (4) enhanced light harvesting by lowering the bandgap. The Ni/TiO2[Vo] photocatalyst has demonstrated highly selective and enhanced photocatalytic activity of more than 18 times higher solar fuel production than the commercial TiO2 (P-25). An insight into the mechanisms of interfacial charge transfer and product formation is explored.

Chen, HM, Chen CK, Liu RS, Wu CC, Chang WS, Chen KH, Chan TS, Lee JF, Tsai DP.  2011.  A new approach to solar hydrogen production: a ZnO–ZnS solid solution nanowire array photoanode. Advanced Energy Materials. 1:742-747.
and W.C. Liu, Wen CY, Chen KH, Lin WC, Tsai* DP.  2001.  Near-field images of the AgOx super-resolution near-field structure. Appl. Phys. Lett.. 78:685-687.
Lin, YG, Hsu YK, Lin YK, Chen SY, Chen LC, Chen* KH.  2009.  Nanostructured ZnO nanorod@Cu nanoparticle as catalyst for microreformers. Angew. Chem. Int. Ed.. 48:7586-7590.
Du, H-Y, Huang Y-F, Wong D, Tseng M-F, Lee Y-H, Wang C-H, Lin C-L, Hoffmann G, Chen K-H, Chen L-C.  2021.  Nanoscale redox mapping at the MoS2-liquid interface, 2021. 12(1):1321. AbstractWebsite

Layered MoS2 is considered as one of the most promising two-dimensional photocatalytic materials for hydrogen evolution and water splitting; however, the electronic structure at the MoS2-liquid interface is so far insufficiently resolved. Measuring and understanding the band offset at the surfaces of MoS2 are crucial for understanding catalytic reactions and to achieve further improvements in performance. Herein, the heterogeneous charge transfer behavior of MoS2 flakes of various layer numbers and sizes is addressed with high spatial resolution in organic solutions using the ferrocene/ferrocenium (Fc/Fc+) redox pair as a probe in near-field scanning electrochemical microscopy, i.e. in close nm probe-sample proximity. Redox mapping reveals an area and layer dependent reactivity for MoS2 with a detailed insight into the local processes as band offset and confinement of the faradaic current obtained. In combination with additional characterization methods, we deduce a band alignment occurring at the liquid-solid interface.

Lan, ZH, Dhara SK, Chen* KH, Wu CT, Chen LC, Hsu CW, Chen CC.  2004.  Nanohomojunction (GaN) and nanoheterojunction (InN) nanorods on 1-dimensional GaN nanowire substrates. Adv. Func. Mater.. 14:233-237.
Kan, MC, Huang* JL, Sung JC, Chen KH, Lii DF.  2003.  Nano-tip emission of tetrahedral amorphous carbon. Diamond & Related Materials. 12:1691-1697.
Han, HC, Lo HC, Wu CY, Chen KH, Chen LC, Ou KL, Hosseinkhani* H.  2015.  Nano-textured Fluidic Biochip as Biological Filter for Selective Survival of Neuronal Cells. J. Biomed. Mater. Res. A . 103:2015.
Wu, JJ, Lu TR, Wu CT, Wang TY, Chen LC, Chen KH, Kuo CT, Yu YC, Wang CW, Lin EK.  1999.  Nano-carbon nitride synthesis from a bio-molecular target for ion beam sputtering at low temperature. Diamond and Related Materials. 8:605-609.
Bloembergen, N, Chen KH, Lu CZ, Mazur E.  1990.  Multiplex Pure Rotational Coherent Anti-Stokes Raman Spectroscopy in a Molecular Beam. J. Raman Spectroscopy. 21:819.
Chen, KH, Lu CZ, Avilas L, Mazur E, Bloembergen N, Shultz MJ.  1989.  Multiplex Coherent Anti-Stokes Raman Spectroscopy Study of Infrared-multiphoton-excited OCS. J. Chem. Phys.. 91:1462.
S. Dhara*, KH, Chandra S, Mangamma G, Kalavathi S, Shankar P, Nair KGM, Tyagi AK, Hsu CW, Kuo CC, Chen LC, Chen KH, Sriram KK.  2007.  Multiphonon Raman scattering in GaN nanowires. Appl. Phys. Lett.. 90:213104.
Roy, PK, Haider G, Lin H-I, Liao Y-M, Lu C-H, Chen K-H, Chen L-C, Shih W-H, Liang C-T, Chen Y-F.  2018.  Multicolor Ultralow-Threshold Random Laser Assisted by Vertical-Graphene Network, 2018. Advanced Optical MaterialsAdvanced Optical Materials. 6(16):1800382.: John Wiley & Sons, Ltd AbstractWebsite

Abstract Application of lasers is omnipresent in modern-day technology. However, preparation of a lasing device usually requires sophisticated design of the materials and is costly, which may limit the suitable choice of materials and the lasing wavelengths. Random lasers, on the other hand, can circumvent the aforementioned shortcomings with simpler fabrication process, lower processing cost, material flexibility for any lasing wavelengths with lower lasing threshold, providing a roadmap for the design of super-bright lighting, displays, Li-Fi, etc. In this work, ultralow-threshold random laser action from semiconductor nanoparticles assisted by a highly porous vertical-graphene-nanowalls (GNWs) network is demonstrated. The GNWs embedded by the nanomaterials produce a suitable cavity for trapping the optical photons with semiconductor nanomaterials acting as the gain medium. The observed laser action shows ultralow values of threshold energy density ≈10 nJ cm?2 due to the strong photon trapping within the GNWs. The threshold pump fluence can be further lowered to ≈1 nJ cm?2 by coating Ag/SiO2 upon the GNWs due to the combined effect of photon trapping and strong plasmonic enhancement. In view of the growing demand of functional materials and novel technologies, this work provides an important step toward realization of high-performance optoelectronic devices.

E. N. Konyushenko, Stejskal* J, Trchova M, Hradi J, Kovarova J, Prokes J, Cieslar M, Hwang JY, Chen KH, Sapurina I.  2006.  Multi-wall carbon nanotubes coated with polyaniline. Polymer. 47:5715-5723.
Qorbani, M, Chou T-chin, Lee Y-H, Samireddi S, Naseri N, Ganguly A, Esfandiar A, Wang C-H, Chen L-C, Chen K-H, Moshfegh AZ.  2017.  Multi-porous Co3O4 nanoflakes @ sponge-like few-layer partially reduced graphene oxide hybrids: towards highly stable asymmetric supercapacitors. Journal of Materials Chemistry A. 5:12569-12577.
Chen, HM, Chen CK, Lin CC, Liu RS, Yang H, Chang WS, Chen KH, Chan TS, Lee JF, Tsai DP.  2011.  Multi-bandgap-sensitized ZnO nanorod photoelectrode arrays for water splitting: an X-ray absorption spectroscopy approach for the electronic evolution under solar illumination. J. Phys. Chem. C. 115:21971-21980.
Hsu, CH, Huang YF, Chen LC, Chattopadhyay* S, Chen KH, Lo HC, Chen CF.  2006.  Morphology control of Si nanotips fabricated by electron cyclotron resonance plasma etching. J. Vac. Sci. Technol. . B24:308-311.
Chen, HM, Chen CK, Chang YC, Tsai CW, Liu RS, Hu SF, Chang WS, Chen KH.  2010.  Monolayer-quantum dots sensitized ZnO nanowires-array photoelectrodes: true efficiency for water splitting. Angew. Chem. Int. Ed.. 49:5966-5969.
Chen, RS, Lu CY, Chen KH, Chen LC.  2009.  Molecule-modulated photoconductivity and gain-amplified selective gas sensing in polar GaN nanowires. Appl. Phys. Lett.. 95:233119.