Universidad Nacional Autónoma de México - CNyN

1st International Symposium on Nanoscience and Nanomaterials
The current voltage (I-V) characteristics show rectifying nature with dynamic transfer resistance ratio
of the order of 10 3 in the forward bias condition. Fig. 2 (a, b) show the current voltage characteristics in the
forward and reverse bias respectively.
Figure 2. I-V characteristics of p-n junction consisting of p-NiO and n-ITO thin films.
In the forward bias condition the curve, as shown in fig. 2 (a), exhibit the rectifying properties,
indicating proper formation of the junction. Fairly high current values of the order of 300 µ A has been
obtained at 0.35 V and the turn-on voltage obtained ~ 0.06 V. A small leakage current as low as 12 nA was
observed at a reverse bias of –5 V. Previously, Tonooka and co-authors [3] reported the average turn on
voltage of their n-ZnO / p-Cu-Al-O diode ~ 0.5 V, which is higher than our p-NiO/n-ITO diodeThe observed
optical and electrical properties of oxide transparent diode are attributed to the heteroepitaxial nature and
carrier diffusion at the junction interface.
1. A.J. Freeman, K.R. Poeppelmeier, T.O. Mason, R.P.H. Chang, T.J. Marks, MRS Bull. (August) (2000) 45.
2. J.F. Wager, Science 300 (2003) 1245.
3.Tonooka K, Bando H, Aiura Y, Thin Solid Films, 445 (2003) 327
P-028
INSITU FORMATION OF GOLD NANOPARTICLES COATED WITH POLY(N,N´-
DIETHYLAMINOETHYLMETHACRYLATE)
A. Licea-Claveríe 1,a , N.A. Cortez-Lemus 1 , G. Alonso-Núñez 2 and F. Paraguay-Delgado 3
1 Centro de Graduados e Investigación, Instituto Tecnológico de Tijuana, A.P. 1166, 22000 Tijuana, B.C.,
México.
2 Centro de Nanociencias y Nanotecnología de la Universidad Nacional Autónoma de México, KM 107
Carretera Tijuana-Ensenada, C.P. 22860 Ensenada, B.C., México
3 Centro de Investigación en Materiales Avanzados (CIMAV) S.C., C.P. 31109 Chihuahua, Chih., México
a aliceac@tectijuana.mx
Keywords: Polymers, Nanoparticles, Gold, polyelectrolytes.
Gold nanoparticles (AuNPs) have been the focus of intense research over the past decade due to their
unique properties and potential application in many areas including biomedical materials, optics, electronics
and catalysis. Thiol chemistry has been widely used to modify the surface of AuNPs with different molecules,
including polymers. Recently, there have been numerous reports utilizing amine containing copolymers that
can act as both a reducing agent and a stabilizing agent in the synthesis of AuNPs. In this contribution we
report the use of RAFT polymerization to prepare poly(N.N´-ditehylaminoethylmethacrylate) (PDEAEM)
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