Electrical transport measured in devices with in 1,4-phenylenediisocyanide

8

10

50 1.0

phenylenediisocyanide

2

4

6

8

A) 30

40

0

200

0.6

0.8

dI/dV A

)

-4

-2

0I(nA

10

20

-2000.2

0.4

()

킪

I (n

A

-0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8-8

-6

Vsd(V)

0

-1000 -500 0 500 1000

-400 0.0

V (mV)sd V (mV)

Lateral Device Vertical Device

0.10

0.05

0.00

Vol

tage

(V)

-0.05

Bia

s V

40 20 0 20 40-0.10

-40 -20 0 20 40

Gate Voltage (V)

0 12500 25000 37500 50000

d(I)/d(Vb) (pA/V)

An Idea borrowed from biologygy

Self assemble

We desire…

Self assembleSelf correctingSelf healingSelf healingGrows on templateSelectively controllable

Biological systems

yRT/ambientRecycles own template

Using biological system for molecular electronicsg g y f

1. Used for self assembly

•DNADN•PNA•Viruses

2. Use themselves as active device elements2. Use themselves as active device elements

Protein transistorsPhotosensitive materialsPhotosensitive materials

S lf ss bl si bi l l sSelf assembly using biomoleculesSelf assembly and device fabrication of carbon nanotubes with DNA ifi lith hDNA sequence specific lithography

K K t lK. Keren et al.

Sequence specific binding of CNTSequence specific binding of CNT

Fabrication of CNTFET templating DNA moleculesFabrication of CNTFET templating DNA molecules

Characteristics of DNA-templated CNTFETCharacteristics of DNA templated CNTFET

PNA assembled carbon nanotubesPNA assembled carbon nanotubes

K. Williams et al.

Virus mediated AssemblyVirus mediated Assembly

Quantum dots assembled with genetically engineered viruses

A. Belcher et al.

Virus as a scaffold for 3-D assembling of Au nanoparticles

Amy Szuchmacher Blum et al.

Virus templated nanowire synthesisp y

A Belcher et alA. Belcher et al.

Assembly and transport of quantum dots using microtubules y p q gand kinesin motor proteins

nl049811hsi20040203_034011.mov

Synthesis of polyaniline nanofibers by enzyme peroxidasey p y y y p

NH2 NH2

NH2

NH2 NH

CiP/H2O2NH

NH NHHN

Synthesis of polyaniline nanofibers by enzyme peroxidase

2

44 V

Electrical transport through PANI nanofibers

-4

-2

02 V

0 V

-2 V

I(nA)

-10

-8

-6

-4 V

-10 -5 0 5 10

V g(V)

19

20iv-0204-Time-Vacuum/Air

AirVacuum

Vsd: 50mVVac: 2.1*10^-4Torr

UV Off

17

18

19

(nA

)

UV Off

UV Off

15

16I

DarkUV On

140 500 1000 1500 2000

Time (S)

Bioelectronic devices

1. Protein transistors2. Photo sensitive materials

Rinaldi et al. 2003

Protein photodetectors with photosynthetic proteinsProtein photodetectors with photosynthetic proteins

Electrical transport measurement on a single protein ferritin

Iron stored

single protein-ferritin

as mineral

V IV I

What is ferritin?

Ferritin; Iron storage protein in biological systemg p g y

•Consists of 24 peptide units p p(molecular weight ~440kDa)•3-fold channels ; Fe(II) transfer•4-fold channels ; electron transfer

Proposed model by Drits (1996 Clay Miner)(1996, Clay. Miner).

Closed-packed hexagonal layers of oxygen (O-2, OH, H2O) in a sequence ABACA,Cell dimensions a=3 Å c=9 4 ÅCell dimensions a 3 Å, c 9.4 Å.Fe in octahedral sites (coordinated to six O atoms)