Section 3 Application

**141**

**Chapter 8**

**Abstract**

Doped Semiconductor Nanocrystals:

*Jerusa M. de Oliveira, Alessandra S. Silva, Éder V. Guimarães,* 

This chapter aims to show significant progress that our group has been developing and the applications of several doped semiconductor nanocrystals (NCs), as nanopowders or embedded in glass systems. Depending on the type of dopant incorporated in the nanocrystals, the physical, chemical, and biological properties can be intensified. However, it can also generate undesired toxic effects that can potentially compromise its use. Here we present the potential of zinc oxide NCs doped with silver (Ag), gold (Au), and magnesium (Mg) ions to control bacterial diseases in agriculture. We have also performed biocompatibility analysis of the pure and Ag-doped sodium titanate (Na2Ti3O7) NCs in *Drosophila*. The doped nanocrystals embedded in glassy systems are chrome (Cr) or copper (Cu) in ZnTe and Bi2Te3 NCs for spintronic development nanodevices. Therefore, we will show several advantages that doped nanocrystals may

**Keywords:** doping, semiconductor nanocrystals, agriculture, biological effects,

The development of new nanocrystals made from the doping of ions in semiconductors creates interesting physical–chemical properties and biological effects. The nanopowders are aiming at agricultural applications, and doped nanocrystals

Bacterial diseases of plants occur in every place that is reasonably moist or warm, and they affect all kinds of plants. Bacterial diseases are prevalent and severe in the humid tropics, but they may be extremely destructive anywhere under favorable environmental conditions [1]. Control bacterial diseases in agriculture are complex because the few registered chemical products and the nanoparticles or nanocrystals emerge as an innovative method in disease management. Zinc-oxide (ZnO) nanoparticles or nanocrystals are among the most commonly used [2–5].

embedded in the glass system can be used in spintronics applications.

Development and Applications

*Francisco R.A. dos Santos, Samanta L.M. de Matos,* 

*Ricardo S. Silva, Lucas Anhezini, Nilvanira D. Tebaldi* 

*Mirella S. Vieira, Eurípedes A. da Silva Filho,* 

present in the technological and biotechnological areas.

development, glass system, nanopowders

**1. Introduction**

*Anielle C.A. Silva, Eliete A. Alvin,* 

*and Noelio O. Dantas*
