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K. J. Chen, Hong WK, Lin CP, Chen KH, Chen* LC, Cheng HC.  2002.  Improvement of field emission characteristics of carbon nanotubes by eximer laser treatment. Jpn. J. Appl. Phys.. 41:6132-6136.
K.P.O., M, Shown I, Chen L-C, Chen K-H, Tai Y.  2018.  Flexible sensor for dopamine detection fabricated by the direct growth of α-Fe2O3 nanoparticles on carbon cloth, 2018. Applied Surface Science. 427:387-395. AbstractWebsite

AbstractPorous α-Fe2O3 nanoparticles are directly grown on acid treated carbon cloth (ACC) using a simple hydrothermal method (denoted as ACC-α-Fe2O3) for employment as a flexible and wearable electrochemical electrode. The catalytic activity of ACC-α-Fe2O3 allowing the detection of dopamine (DA) is systematically investigated. The results showed that the ACC-α-Fe2O3 electrode exhibits impressive electrochemical sensitivity, stability and selectivity for the detection of DA. The detection limit determined with the amperometric method appears to be around 50nM with a linear range of 0.074–113μM. The impressive DA sensing ability of the as prepared ACC-α-Fe2O3 electrode is due to the good electrochemical behavior and high electroactive surface area (19.96cm2) of α-Fe2O3 nanoparticles anchored on the highly conductive ACC. It is worth noting that such remarkable sensing properties can be maintained even when the electrode is in a folded configuration.

Kamal Hussien, M, Sabbah A, Qorbani M, Hammad Elsayed M, Raghunath P, Lin T-Y, Quadir S, Wang H-Y, Wu H-L, Tzou D-LM, Lin M-C, Chung P-W, Chou H-H, Chen L-C, Chen K-H.  2021.  Metal-free four-in-one modification of g-C3N4 for superior photocatalytic CO2 reduction and H2 evolution, 2021. Chemical Engineering Journal. :132853. AbstractWebsite

Utilization of g-C3N4 as a single photocatalyst material without combination with other semiconductor remains challenging. Herein, we report a facile green method for synthesizing a metal free modified g-C3N4 photocatalyst. The modification process combines four different strategies in a one-pot thermal reaction: non-metal doping, porosity generation, functionalization with amino groups, and thermal oxidation etching. The as-prepared amino-functionalized ultrathin nanoporous boron-doped g-C3N4 exhibited a high specific surface area of 143.2 m2 g−1 which resulted in abundant adsorption sites for CO2 and water molecules. The surface amino groups act as Lewis basic sites to adsorb acidic CO2 molecules, which can also serve as active sites to facilitate hydrogen generation. Besides, the simultaneous use of ammonium chloride as a dynamic gas bubble template along with thermal oxidation etching efficiently boosts the delamination of the g-C3N4 layers to produce ultrathin sheets; this leads to stronger light–matter interactions and efficient charge generation. Consequently, the newly modified g-C3N4 achieved selective gas-phase CO2 reduction into CO with a production yield of 21.95 µmol g-1, in the absence of any cocatalyst. Moreover, a high hydrogen generation rate of 3800 µmol g-1 h-1 and prominent apparent quantum yield of 10.6% were recorded. This work opens up a new avenue to explore different rational modifications of g-C3N4 nanosheets for the efficient production of clean energy.

Kamal Hussien, M, Sabbah A, Qorbani M, Hammad Elsayed M, Quadir S, Raghunath P, Tzou D-LM, Haw S-C, Chou H-H, Thang NQ, Lin M-C, Chen L-C, Chen K-H.  2023.  Numerous defects induced by exfoliation of boron-doped g-C3N4 towards active sites modulation for highly efficient solar-to-fuel conversion, 2023. Materials Today Sustainability. 22:100359. AbstractWebsite

Graphitic carbon nitride (CN) has emerged as a highly promising material in the photocatalysis field. However, its bulk structure suffers from a lack of active sites, limiting its practical application. Herein, a boron-doped CN (BCN) was prepared by a green gas-blowing-assisted thermal polymerization and then subjected to different exfoliation processes in order to delaminate the layered structure and tune the surface-active sites. A thorough comparative study shows that thermal exfoliation creates unsaturated nitrogen sites and induces the formation of interconnected layers that act as an electron diffusion channel for better charge transport. Furthermore, the thermally exfoliated BCN is rich in structural disorders that serve as dissociation defects for photoinduced charge carriers with a low exciton binding energy of 27 meV. Experimental results supported by theoretical calculations show that the nitrogen adjacent to boron is activated by the surrounding surface amino groups and the perforated texture to serve as an active adsorption site towards CO2 and H2O. Consequently, the exfoliated BCN acts as an outstanding bifunctional photocatalyst towards CO2 reduction into CO (40.41 μmol g−1 h−1) and prominent hydrogen evolution (4740 μmol g−1 h−1, 12.2% apparent quantum yield (AQY)).

Kan, MC, Huang* JL, Sung J, Lii DF, Chen KH.  2003.  Field emission characteristics of amorphous diamond. J. Am. Cherem. Soc.. 86:1513-1517.
Kan, MC, Huang* JL, Sung JC, Chen KH, Lii DF.  2003.  Nano-tip emission of tetrahedral amorphous carbon. Diamond & Related Materials. 12:1691-1697.
Kan, MC, Huang* JL, Sung JC, Chen KH, Lii DF.  2003.  Enhanced field emission from nitrogen-doped amorphous diamond. J. Mater. Res.. 18:1594-1599.
Karlsson, KF, Amloy S, Chen YT, Chen KH, Hsu HC, Hsiao CL, Chen LC, Holtz PO.  2012.  Polarized emission and excitonic fine structure energies of InGaN quantum dots. Physica B-Condensed Matter. 407:1553.
Kataria, S, Liu TW, Hsiao CL, Dhara S, Chen LC, Chen KH, Dash S, Tyagi AK.  2010.  Growth orientation dependent hardness for epitaxial wurtzite InN films. J. Nanosci. Nanotechnol.. 10:5170-5174.
Kichambare, PD, Tarntair FG, Wang TY, Chen LC, Chen KH, Cheng HC.  1999.  Enhancement in Field Emission of Silicon Micro-tips by Bias-assisted Carburization. the Appl. Diamond Conference and Frontier Carbon Tech. Joint Conference 1999. :353-358., Tsukuba, Japan
Kichambare, PD, Tarntair FG, Wang TY, Chen LC, Chen KH, Cheng HC.  2000.  Enhancement in field emission of silicon microtips by bias-assisted carburization. J. Vac. Sci. Tech.. B18:2722-2729.
Krishnamoorthy, V, Sabhapathy P, Raghunath P, Huang C-Y, Sabbah A, Kamal Hussien M, Syum Z, Muthusamy S, Lin M-C, Wu H-L, Chen R-S, Chen K-H, Chen L-C.  2024.  Synergistic Electronic Interaction of Nitrogen Coordinated Fe-Sn Double-Atom Sites: An Efficient Electrocatalyst for Oxygen Reduction Reaction, 2024. Small MethodsSmall Methods. n/a(n/a):2301674.: John Wiley & Sons, Ltd AbstractWebsite

Abstract Double-atom site catalysts (DASs) have emerged as a recent trend in the oxygen reduction reaction (ORR), thereby modifying the intermediate adsorption energies and increasing the activity. However, the lack of an efficient dual atom site to improve activity and durability has limited these catalysts from widespread application. Herein, the nitrogen-coordinated iron and tin-based DASs (Fe-Sn-N/C) catalyst are synthesized for ORR. This catalyst has a high activity with ORR half-wave potentials (E1/2) of 0.92 V in alkaline, which is higher than those of the state-of-the-art Pt/C (E1/2 = 0.83 V), Fe-N/C (E1/2 = 0.83 V), and Sn-N/C (E1/2 = 0.77 V). Scanning electron transmission microscopy analysis confirmed the atomically distributed Fe and Sn sites on the N-doped carbon network. X-ray absorption spectroscopy analysis revealed the charge transfer between Fe and Sn. Both experimental and theoretical results indicate that the Sn with Fe-NC (Fe-Sn-N/C) induces charge redistribution, weakening the binding strength of oxygenated intermediates and leading to improved ORR activity. This study provides the synergistic effects of DASs catalysts and addresses the impacts of P-block elements on d-block transition metals in ORR.

Kuo, CK, Hsu CW, Wu CT, Lan ZH, Mou CY, Chen CC, Yang YJ, Chen LC, Chen* KH.  2006.  Self-regulating and diameter-selective growth of GaN nanowires. Nanotechnology. 17:S332-337.
Kuo, CT, Lu TR, Chen LC, Chen KH.  2000.  Implication from using two different bio-molecular materials to synthesize crystalline carbon nitride films. J. Vac. Sci. Tech. B. 18:1207.
Kuo, CT, Chen LC, Chen KH, Chen TM, Lu TR.  1999.  Effect of target materials on crystalline carbon nitride films preparation by ion beam sputtering. Diamond & Related Materials. 8:1724-1729.
Kuo, CT, Chen LC, Chen KH, Chen TM, Lu TR.  1999.  Effect of Target Materials on Crystalline Carbon Nitride Films Preparation by Ion Beam Sputtering. Diamond & Related Materials. 8:1724.