Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica Applications of Graphitic Carbon Materials Dr. Lain-Jong Li (Lance Li) Associate Research Fellow Research Center for Applied Science Academia Sinica, Taiwan

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica Single-Walled Carbon Nanotubes for Macroelectronics

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica Solution processable Printable ( Adv. Mater. 2010) (Chem. Comm. 2009) 1. Transistors based on carbon nanotube networks

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica 2. Carbon Nanotube Networks as DNA sensors 1. Devices are fabricated by microelectronic fabrication. 2. DNA addition directly affects the transfer characteristics 3. Detection limit: ~ 10 nM DNA Bare Immobilized Hybridized Intercalated Appl. Phys. Lett. 89, (2006)

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica Changing the contact metals 2.1 Study of Sensing Mechanism

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica Covering the contacts SWNT channels slightly response to DNA molecules But electrode-SWNT Contacts seem to play more important roles ( J. Am. Chem. Soc. 129, 14427, 2007)

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica More charges can be introduced to the DNA with reporter DNA 2.2 Introducing more charges

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica The DNA detection limit is dramatically improved from 1 nM to 100 fM by using reporter DNA-AuNP conjugates ( Adv. Mater. 20, 2389, 2008) Sensitivity enhancement

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica Graphene-related

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica 1. Large Size Graphene Oxides Chem. of Mater. 21, 5674 (2009) Ultra-large single layer graphene oxides ( up to mm size) ( absorption ~ 2%)

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica * 1 st stage: I(D) increases with richness of 6-fold aromatic rings * 2 nd stage: I(D) is inversely proportional to the graphene domain size (T-K relations) 2. Graphene Oxide Reduction by Alcohol

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica * Graphene domain size is dominating conduction properties (submitted) Graphene Oxide Reduction by Alcohol

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica Substrate: Ni foil, 30 μm in thickness Step 1: H 2 Step 2: H 2 Step 3: CH 4 /H 2 Step 4: Ar 900 ºC RT 1234 Pressure: 0.1~1 Torr and 750 Torr on Cu and Ni substrates respectively. 30 min 30 min 10~20 min 3. CVD Graphene

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica FLG Cu foil Rub one side FLG by sandpaper FLG Cu foil FLG Cu foil Immerse FLG/Cu foil in ~ 1.5 wt% FeCl 3 solution FeCl 3 solution FLG FeCl 3 solution Wait for several hours Dilute FeCl 3 solution and transfer to new substrate, such as PET, SiO 2 Heat at 80 0 C for 5-10 minutes (a) (b) FLG New Substrate FLG Transfer to the desired substrates

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica 4.1 Doping of Graphene from Substrates Charge exchange may occur between graphene and SiO2 SiO 2 Effective doping in graphene monolayer

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica Doping of Monolayered graphene depends on the surface potential of SiO2 substrates Phys. Rev. B 79, (2009)

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica 4.2 Doping of Graphene by Aromatic Molecular Adsorption Small 5, 1422 (2009)

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica 4.3 Stable Doping of CVD Graphene by AuCl3 Work Function is Tunable

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica Work function

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica Work function is tunable ACS Nano (2010 in press)

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica Tetrasodium 1,3,6,8-pyrenetetrasulfonic acid (TPA) Strong electron-withdrawing groups attached to pyrene 5. Aromatic molecules on Graphene

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica a full geometry optimization is performed including the optimization of the lattice constants using the DMol3 package (with all electrons considered) and the GGA (PBE) and DNP basis sets. Once the optimized structure is obtained, the force constants are calculated directly by altering atomic positions in both pristine and decorated graphene. ( ~4% different from those in pristine graphene) *Various aromatic molecules result in different energies of G-band splitting. Phys. Rev. Lett. 102, (2009) Phonon Symmetry Breaking- DFT calculation

Frontier NanoCarbon Research group Research Center for Applied Sciences, Academia Sinica 1.Gap Opening: Stripping ? AB-stacked bilayer graphene ? How to grow bilayer graphene with desired stacking 2.Effect of defects on transport? 3.Effect of graphene edge (or edge defect)? Ongoing study