School of Physics and Astronomy

Dr John Dennis

John

Reader in Molecular Nanostructural Materials

Email: j.dennis@qmul.ac.uk
Telephone: 020 7882 3412
Room Number: G.O. Jones Building, Room 119

Profile

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Research

Research Interests:

My research interests

Dr Dennis' research centers on the synthesis, purification, and spectroscopic characterization of novel fullerene related materials. Dr Dennis conducted pioneering work in the synthesis and purification of fullerenes. During August 1990 Dr Dennis beacme the first researcher to synthesize and purify the archetypal fullerene C60 (i.e., to do both) and since then was the first to purified more fullerenes isomers than all other researchers combined; including all 9 known isomers of the third most abundant fullerene C84. To this end he has developed several counter to proper practice HPLC techniques for fullerene purification that are now commonly used in many fullerene research labs throughout the world. His present research interest include:

Temperature-dependent structural studies: through NMR spectroscopy (molecular and dynamical) and XRD (crystal). Temperature-dependant vibrational studies via FTIR and FT-Raman.

Double-walled nanotubes: developing the production and purification of double-walled carbon nanotubes (by both pulsed arc, and CVD techniques), and to exploit the durability of double-walled nanotubes to produce more reliable nano-transistors, and materials with potential applications for field emission-based flat screen displays.

Carbon peapods: By encapsulating metal element containing endohedral fullerenes within carbon nanotubes tube, the band gap tubes can be narrowed (at the points corresponding to the positions of the endohedral fullerene). Preliminary results indicate these carbon peapods can be p-type, n-type, or am-bipolar, depending on the encapsulated atom. The effects of the encapsulated atom on the electronic transport of the fullerene is investigated.

Endohedral fullerenes as contrast agents for MRI.: Gadolinium-containing endohedral fullerenes are promising species for contrast enhancement in MRI, these species have several advantages over conventional agents. The incarcerated highly toxic Gd3+ ion is severely sterically hindered to dissociation, and they are about 20 times as effective, thus are required in much smaller doses. We, in collaboration with researchers at the Institute of Chemistry at the Chinese Academy of Sciences in Beijing are currently investigating functionalisation of these species to make them water-soluble and specific tissue targeting. For example, we have recently produced bone-targeting Gd-based endohedral fullerenes.

Quantum information processing: The ESR of the nitrogen-containing endohedral fullerene iNC60 has hyperfine lines at least two orders of magnitude narrower then any other known radical, making it a possible qubit candidate for quantum computation. Having recently performed the first (and still only) isolation of iNC60, I intend to systematically investigate the potential of nitrogen- and phosphorous-containing incar-fullerenes, as dimers as novel building-block materials for electron spin-based scalable solid-state quantum computation.

Isomer-pure fullerene and endohedral fullerene-based Transistors: Recently our group has begun researching the use of fullerenes and endohedral fullerenes in semi-conductor devices, including transistors.

Before joining QMUL, Dr Dennis conducted postdoctoral research under a series of personal research fellowships from the Australian Research Council, the Japan Society for the Promotion of Science, and the Alexander von Humboldt Foundation. He gained his D.Phil. under the supervision of Prof .Harry Kroto at the University of Sussex in 1993.

Publications

  • ZHAO X, LIU T, SHI W et al. (2019). Capillary-Written Single-Crystalline All-Inorganic Perovskite Microribbon Arrays for Highly-Sensitive and Thermal-Stable Photodetectors. nameOfConference
  • ZHAO X, LIU T, Liu H et al. (2018). Organic Single-Crystalline p-n Heterojunctions for High- Performance Ambipolar Field-Effect Transistors and Broadband Photodetectors. nameOfConference
  • ZHAO X, LIU T, Zhang Y et al. (2018). Organic Single-Crystalline Donor-Acceptor Heterojunctions with Ambipolar Band-Like Charge Transport for Photovoltaics. nameOfConference
  • ZHAO X, LIU T, HOU X et al. (2018). [60]PCBM Single Crystals: Remarkably Enhanced Band-like Charge Transport, Broadband UV-Visible-NIR Photo-responsivity and Improved Long-term Air-stability. nameOfConference
  • Zhao X, Liu T, Cui Y et al. (2018). Antisolvent-assisted controllable growth of fullerene single crystal microwires for organic field effect transistors and photodetectors.. nameOfConference
  • ZHAO X, LIU T, SHI W et al. (2018). Understanding Charge Transport in Endohedral Fullerene Single-Crystal Field-Effect Transistors. nameOfConference
  • LIU T, ABRAHAMS I, DENNIS T (2018). Structural Identification of 19 Purified Isomers of the OPV Acceptor Material bisPCBM by 13C NMR and UV-Vis Absorption Spectroscopy and High Performance Liquid Chromatography. nameOfConference
  • Zhang F, Shi W, Luo J et al. (2017). Isomer-pure bis-PCBM assisted crystal engineering of perovskite solar cells showing excellent efficiency and stability. nameOfConference
  • Shi W, Hou X, Liu T et al. (2017). Purification and electronic characterisation of 18 isomers of the OPV acceptor material bis-[60]PCBM.. nameOfConference
  • Peci T, Dennis TJS, Baxendale M (2015). Iron-filled multiwalled carbon nanotubes surface-functionalized with paramagnetic Gd (III): A candidate dual-functioning MRI contrast agent and magnetic hyperthermia structure. nameOfConference
  • Johansson JO, Bohl E, Henderson GG et al. (2013). Hot electron production and diffuse excited states in C70, C82, and Sc3N@C80 characterized by angular-resolved photoelectron spectroscopy.. nameOfConference
  • Olof Johansson J, Bohl E, Henderson GG et al. (2013). Hot electron production and diffuse excited states in C70, C82, and Sc3N@C80 characterized by angular-resolved photoelectron spectroscopy. nameOfConference
  • Muthukumar K, Strozecka A, Myslivecek J et al. (2013). Endohedral Fullerene Ce@C-82 on Cu(111): Orientation, Electronic Structure, and Electron-Vibration Coupling. nameOfConference
  • Strozecka A, Muthukumar K, Larsson JA et al. (2011). Electron-induced excitation of vibrations of Ce atoms inside a C-80 cage. nameOfConference
  • Li B, Shu CY, Lu X et al. (2010). Addition of Carbene to the Equator C-70 To Produce the Most Stable C71H2 Isomer: 2aH-2(12)a-Homo(C-70-D-5h(6))[5,6]fullerene. nameOfConference
  • Stróecka A, Muthukumar K, Dybek A et al. (2009). Modification of the conductance of single fullerene molecules by endohedral doping. nameOfConference
  • Dennis TJS, Shinohara H, Margadonna S et al. (2009). Isolation and characterisation of [84]fullerene isomers. International Winterschool on Electronic Properties of Novel Materials
  • Yan C, Dybek A, Hanson C et al. (2009). Langmuir-Blodgett films of C60 and C60-O on Silicon: Islands, rings and grains.. nameOfConference
  • Shu CY, Wang CR, Zhang JF et al. (2008). Organophosphonate functionalized Gd@C-82 as a magnetic resonance imaging contrast agent. nameOfConference
  • Booth EC, Bachilo SM, Kanai M et al. (2007). Photophysical properties of C-84 major isomers. nameOfConference
  • Baxendale M, Melli M, Alemipour Z et al. (2007). Quantum conductance in single- and double-wall carbon nanotube networks. nameOfConference
  • Porfyrakis K, Leigh DF, Owen JHG et al. (2006). Isolation, spectroscopic characterization and study of island formation of two isomers of the metallofullerene Nd@C82. nameOfConference
  • Morley GW, Herbert BJ, Lee SM et al. (2005). Hyperfine structure of Sc@C-82 from ESR and DFT. nameOfConference
  • Leigh DF, Owen JHG, Lee SM et al. (2005). Distinguishing two isomers of Nd@C-82 by scanning tunneling microscopy and density functional theory. nameOfConference
  • Theobald JA, Oxtoby NS, Champness NR et al. (2005). Growth induced reordering of fullerene clusters trapped in a two-dimensional supramolecular network. nameOfConference
  • Schulte K, Wang L, Moriarty PJ et al. (2005). Well-shielded cerium atoms: Electronic structure of adsorbed Ce@C-82 on Si surfaces. nameOfConference
  • Porfyrakis K, Kanai M, Morley GW et al. (2005). Isolation and spectroscopic characterization of two isomers of the metallofullerene Nd@C-82. nameOfConference
  • Wang L, Schulte K, Woolley RAJ et al. (2004). Morphology, structure, and electronic properties of Ce@C-82 films on Ag : Si(111)-(root 3x root 3)R30 degrees. nameOfConference
  • Wang L, Schulte K, Woolley RAJ et al. (2004). Morphology, structure, and electronic properties of Ce@C82 films on Ag:Si(1 1 1)-(√3×3)R30°. nameOfConference
  • Khlobystov AN, Porfyrakis K, Britz DA et al. (2004). Ordering and interaction of molecules encapsulated in carbon nanotubes. nameOfConference
  • De Nadai C, Mirone A, Dhesi SS et al. (2004). Local magnetism in rare-earth metals encapsulated in fullerenes. nameOfConference
  • Woolley RAJ, Schulte KHG, Wang L et al. (2004). Does an encapsulated atom 'feel' the effects of adsorption?: X-ray standing wave spectroscopy of Ce@C-82 on Ag(111). nameOfConference
  • Kanai M, Porfyrakis K, Briggs GAD et al. (2004). Purification by HPLC and the UV/Vis absorption spectra of the nitrogen-containing incar-fullerenes iNC(60), and iNC(70). nameOfConference
  • Porfyrakis K, Khlobystov AN, Britz DA et al. (2004). Inserting fullerene dimers into carbon nanotubes: Pushing the boundaries of molecular self-assembly. nameOfConference
  • Khlobystov AN, Porfyrakis K, Kanai M et al. (2004). Molecular motion of endohedral fullerenes in single-walled carbon nanotubes. nameOfConference
  • O'Shea JN, Phillips MA, Taylor MDR et al. (2003). Competing interactions of noble metals and fullerenes with the Si(111)7X7 surface. nameOfConference
  • Ardavan A, Austwick M, Benjamin SC et al. (2003). Nanoscale solid-state quantum computing. nameOfConference
  • Butcher MJ, Nolan JW, Hunt MRC et al. (2003). Adsorption and manipulation of endohedral and higher fullerenes on Si(100)-2x1. nameOfConference
  • Porfyrakis K, Britz DA, Khlobystov AN et al. (2003). Endohedral fullerene dimers as potential building blocks for a quantum computer. nameOfConference
  • Kanai M, Porfyrakis K, Khlobystov AN et al. (2003). Tumbling cerium atoms inside the fullerene cage: iCe(2)C(80). nameOfConference
  • Margiolaki I, Margadonna S, Prassides K et al. (2002). High pressure study of the C-84 fullerene. nameOfConference
  • Assimopoulos S, Meletov KP, Kourouklis GA et al. (2002). Pressure response of the higher fullerene C-84 studied by Raman and X-ray scattering. nameOfConference
  • Kanai M, Dennis TJS, Shinohara H (2002). Purification and characterization of cerium endohedral fullerenes. nameOfConference
  • Denning MS, Dennis TJS, Rosseinsky MJ et al. (2001). K3+delta C84. Higher fullerene analogues of the A(3)C(60) superconductors. nameOfConference
  • Denning MS, Dennis TJS, Rosseinsky MJ et al. (2001). K3+δC84. Higher fullerene analogues of the A3C60 superconductors. nameOfConference
  • Butcher MJ, Nolan JN, Hunt MRC et al. (2001). Orientationally ordered island growth of higher fullerenes on Ag/Si(111)-(root 3X root 3)R30 root degrees. nameOfConference
  • Butcher MJ, Nolan JW, Hunt MRC et al. (2001). Orientationally ordered island growth of higher fullerenes on Ag/Si(111)-(√3 ×√3)R30°. nameOfConference
  • Azamar-Barrios JA, Dennis TJS, Sadhukan S et al. (2001). Characterization of six isomers of [84]fullerene C-84 by electrochemistry, electron spin resonance spectroscopy, and molecular energy levels calculations. nameOfConference
  • Hino S, Umishita K, Iwasaki K et al. (2001). Ultraviolet photoelectron spectra of metallofullerenes, two Ca@C-82 isomers. nameOfConference
  • Kanai M, Waiblinger M, Weidinger A et al. (2001). High-pressure liquid chromatographic purification on [60]fullerene-incar-nitrogen, iNC(60). nameOfConference
  • Dennis TJS, Hulman M, Kuzmany H et al. (2000). Vibrational infrared spectra of the two major isomers of [84]fullerene: C-84{D-2(IV)} and C-84(D-2d(II)}. nameOfConference
  • Inakuma M, Yamamoto E, Kai T et al. (2000). Structural and electronic properties of isomers of Sc-2@C-84(I, II, III): C-13 NMR and IR/Raman spectroscopic studies. nameOfConference
  • Krause M, Hulman M, Kuzmany H et al. (2000). Low-energy vibrations in Sc-2@C-84 and Tm@C-82 metallofullerenes with different carbon cages. nameOfConference
  • Krause M, Hulman M, Kuzmany H et al. (2000). Bonding and dynamics of diatomic metal encapsulates in carbon cages. nameOfConference
  • Dennis TJS, Kai T, Asato K et al. (1999). Isolation and characterization by13C NMR spectroscopy of [84]fullerene minor isomers. nameOfConference
  • Krause M, Hulman M, Kuzmany H et al. (1999). Diatomic metal encapsulates in fullerene cages: A Raman and infrared analysis of C84and Sc2@C84with D2dsymmetry. nameOfConference
  • Dennis TJS, Kai T, Asato K et al. (1999). Isolation and Characterization by 13 C NMR Spectroscopy of [84]Fullerene Minor Isomers. nameOfConference
  • Boltalina OV, Avakyan TV, Markov VY et al. (1999). Formation of C 76 F 38 , C 78 F 38 , C 82 F 44 , C 84 F 40 , and C 84 F 44. nameOfConference
  • Waiblinger M, Pietzak B, Lips K et al. (1999). Atomic hydrogen in the Si8O12 cage. 13th International Winter School on Electronic Properties of Novel Materials : Science and Technology of Molecular Nanostructures
  • Krause M, Hulman M, Kuzmany H et al. (1999). A Raman study of empty C-84 isomers D-2 and D-2d and three isomers of Sc-2@C-84. The 13th international winterschool on electronic properties of novel materials- science and technology of molecular nanostructures
  • Kalina OG, Tumanskii BL, Bashilov VV et al. (1999). Addition of phosphoryl radicals to [76]fullerene gives six stable regioisomeric spin-adducts: MNDO/PM3 calculations of spin densities. nameOfConference
  • Tagmatarchis N, Avent AG, Prassides K et al. (1999). Separation, isolation and characterisation of two minor isomers of the [84]fullerene C-84. nameOfConference
  • Margadonna S, Brown CM, Dennis TJS et al. (1998). Crystal Structure of the Higher Fullerene C84. nameOfConference
  • Allen KM, Dennis TJS, Rosseinsky MJ et al. (1998). Isomer specific intercalation chemistry: Potassium insertion into the D2 and D(2d) isomers of C84. nameOfConference
  • Dennis TJS, Shinohara H (1998). Production and isolation of the C80-based group 2 incar-fullerenes: ICaC80, iSrC80and iBaC80. nameOfConference
  • Dennis TJS, Shinohara H (1998). Isolation and characterisation of the two major isomers of [84]fullerene (C84). nameOfConference
  • Dennis TJS, Shinohara H (1997). Production and isolation of endohedral strontium- and barium-based mono-metallofullerenes: Sr/Ba@C-82 and Sr/Ba@C-84. nameOfConference
  • Diogo HP, Minas Da Piedade ME, Darwish AD et al. (1997). Enthalpy of formation of C70. nameOfConference
  • Schenck A, Gygax FN, Amato A et al. (1994). Zero residual polarization of negative muons implanted in C60. nameOfConference
  • Nikolaev AV, Dennis TJS, Prassides K et al. (1994). Molecular structure of the C70fullerene. nameOfConference
  • CHRISTIDES C, DENNIS TJS, PRASSIDES K et al. (1994). ROTATIONAL-DYNAMICS OF SOLID C-70 - A NEUTRON-SCATTERING STUDY. nameOfConference
  • Dennis TJS (1993). Structure and Dynamics of the Fullerenes C60 and C70. nameOfConference
  • Dennis TJS, Prassides K, Roduner E et al. (1993). Rotational dynamics of solid C70 monitored by positive muon spin labels. nameOfConference
  • DIOGO HP, DAPIEDADE MEM, DENNIS TJS et al. (1993). ENTHALPIES OF FORMATION OF BUCKMINSTERFULLERENE (C-60) AND OF THE PARENT IONS C-60+, C-602+, C-603+ AND C-60-. nameOfConference
  • Christides C, Thomas IM, Dennis TJS et al. (1993). Pressure and temperature evolution of the structure of solid c70. nameOfConference
  • TAYLOR R, LANGLEY GJ, AVENT AG et al. (1993). C-13 NMR-SPECTROSCOPY OF C-76, C-78, C-84 AND MIXTURES OF C-86-C102 - ANOMALOUS CHROMATOGRAPHIC BEHAVIOR OF C-82, AND EVIDENCE FOR C70H12. nameOfConference
  • TAYLOR R, AVENT AG, BIRKETT PR et al. (1993). ISOLATION, CHARACTERIZATION, AND CHEMICAL-REACTIONS OF FULLERENES. nameOfConference
  • Christides C, Nikolaev AV, Dennis TJS et al. (1993). Inelastic neutron-scattering study of the intramolecular vibrations of the C70 fullerene. nameOfConference
  • PRASSIDES K, DENNIS TJS, CHRISTIDES C et al. (1992). MU-AT-THE-COST-OF-C70 - MONITORING THE DYNAMICS OF FULLERENES FROM INSIDE THE CAGE. nameOfConference
  • Soper AK, David WIF, Sivia DS et al. (1992). A pair correlation function study of the structure of C60. nameOfConference
  • TAYLOR R, LANGLEY GJ, DENNIS TJS et al. (1992). A MASS-SPECTROMETRIC NMR-STUDY OF FULLERENE-78 ISOMERS. nameOfConference
  • TAYLOR R, LANGLEY GJ, MEIDINE MF et al. (1992). FORMATION OF C60PH12 BY ELECTROPHILIC AROMATIC-SUBSTITUTION. nameOfConference
  • TAYLOR R, HOLLOWAY JH, HOPE EG et al. (1992). NUCLEOPHILIC-SUBSTITUTION OF FLUORINATED C-60. nameOfConference
  • DAVID WIF, IBBERSON RM, DENNIS TJS et al. (1992). STRUCTURAL PHASE-TRANSITIONS IN THE FULLERENE C-60. nameOfConference
  • LEACH S, VERVLOET M, DESPRES A et al. (1992). ELECTRONIC-SPECTRA AND TRANSITIONS OF THE FULLERENE C-60. nameOfConference
  • David WI, Ibberson RM, Dennis TJ et al. (1992). Structural phase transitions in the fullerene C60. nameOfConference
  • TAYLOR R, AVENT AG, DENNIS TJ et al. (1992). NO LUBRICANTS FROM FLUORINATED C-60. nameOfConference
  • DENNIS TJ, HARE JP, KROTO HW et al. (1992). FOURIER-TRANSFORM RAMAN-SPECTRA OF THE NEWLY PRODUCED ALLOTROPES OF CARBON C-60 AND C-70. nameOfConference
  • Prassides K, Dennis TJS, Christides C et al. (1992). Mu@C70: Monitoring the dynamics of fullerenes from inside the cage. nameOfConference
  • PRASSIDES K, DENNIS TJS, HARE JP et al. (1991). INELASTIC NEUTRON-SCATTERING SPECTRUM OF THE FULLERENE C60. nameOfConference
  • Dennis TJ, Firth S, Kroto HW et al. (1991). Detection of chlorophosphaethyne, Cl-C≡P, by photoelectron spectroscopy. nameOfConference
  • DWORKIN A, FABRE C, SCHUTZ D et al. (1991). THERMODYNAMIC CHARACTERIZATION OF THE CRYSTALLINITY OF FOOTBALLENE C-60. nameOfConference
  • DAVID WIF, IBBERSON RM, MATTHEWMAN JC et al. (1991). CRYSTAL-STRUCTURE AND BONDING OF ORDERED C60. nameOfConference
  • Blau WJ, Byrne HJ, Cardin DJ et al. (1991). Large infrared nonlinear optical response of C60.. nameOfConference
  • GASYNA Z, SCHATZ PN, HARE JP et al. (1991). THE MAGNETIC CIRCULAR-DICHROISM AND ABSORPTION-SPECTRA OF C60 ISOLATED IN AR MATRICES. nameOfConference
  • HOLLOWAY JH, HOPE EG, TAYLOR R et al. (1991). FLUORINATION OF BUCKMINSTERFULLERENE. nameOfConference
  • TAYLOR R, PARSONS JP, AVENT AG et al. (1991). DEGRADATION OF C60 BY LIGHT. nameOfConference
  • DWORKIN A, SZWARC H, LEACH S et al. (1991). THERMODYNAMIC EVIDENCE FOR A PHASE-TRANSITION IN CRYSTALLINE FULLERENE C-60. nameOfConference
  • DENNIS TJ, FIRTH S, KROTO HW et al. (1991). DETECTION OF CHLOROPHOSPHAETHYNE, CHLOROMETHYLIDYNE PHOSPHINE CL - C=P, BY PHOTOELECTRON-SPECTROSCOPY. nameOfConference
  • HARE JP, DENNIS TJ, KROTO HW et al. (1991). THE IR-SPECTRA OF FULLERENE-60 AND FULLERENE-70. nameOfConference
  • DENNIS TJ, HARE JP, KROTO HW et al. (1991). THE VIBRATIONAL RAMAN-SPECTRA OF C-60 AND C-70. nameOfConference
  • DENNIS TJ, FIRTH S, KROTO HW et al. (1990). DETECTION OF C-CHLOROPHOSPHAETHYNE (CLCP) BY MICROWAVE SPECTROSCOPY. nameOfConference