Thermal Stability of Black Aluminum Films and Growth of Aluminum Nanowires from Mechanical Defects on the Film Surface during Annealing

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F21%3A43923195" target="_blank" >RIV/60461373:22340/21:43923195 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/22:00552119

Výsledek na webu

<a href="https://onlinelibrary.wiley.com/doi/10.1002/pssb.202100467" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1002/pssb.202100467</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/pssb.202100467" target="_blank" >10.1002/pssb.202100467</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal Stability of Black Aluminum Films and Growth of Aluminum Nanowires from Mechanical Defects on the Film Surface during Annealing

Popis výsledku v původním jazyce

The thermal stability of black aluminum (Black Al) films deposited on unheated fused silica substrates by pulsed DC magnetron sputtering is investigated. The deposited films have porous moth-eye morphology and a relatively soft surface that can be easily damaged mechanically. Photothermally stimulated exoelectron emission (PTSE) spectra of the films have emission peaks at 180 and 300 °C, which can be associated with processes of aluminum recrystallization occurring at these temperatures. The total emitted charge of PTSE decreases according to a power law with each subsequent heating, indicating that the most pronounced structural changes on the film surface occur during its first annealing. The shape of the mechanically intact pores of the films does not change after heating. However, spiral-shaped aluminum nanowires grow from scratches and abrasions on the film surface already after heating up to 200 °C due to the stress-induced migration of aluminum atoms. When scratches are deliberately applied to the surface of an already annealed film, the nanowires do not grow when the film is reheated. The results of this study show that mechanically intact as-deposited Black Al films are thermally stable up to temperatures of at least 400 °C. © 2021 Wiley-VCH GmbH.

Název v anglickém jazyce

Thermal Stability of Black Aluminum Films and Growth of Aluminum Nanowires from Mechanical Defects on the Film Surface during Annealing

Popis výsledku anglicky

The thermal stability of black aluminum (Black Al) films deposited on unheated fused silica substrates by pulsed DC magnetron sputtering is investigated. The deposited films have porous moth-eye morphology and a relatively soft surface that can be easily damaged mechanically. Photothermally stimulated exoelectron emission (PTSE) spectra of the films have emission peaks at 180 and 300 °C, which can be associated with processes of aluminum recrystallization occurring at these temperatures. The total emitted charge of PTSE decreases according to a power law with each subsequent heating, indicating that the most pronounced structural changes on the film surface occur during its first annealing. The shape of the mechanically intact pores of the films does not change after heating. However, spiral-shaped aluminum nanowires grow from scratches and abrasions on the film surface already after heating up to 200 °C due to the stress-induced migration of aluminum atoms. When scratches are deliberately applied to the surface of an already annealed film, the nanowires do not grow when the film is reheated. The results of this study show that mechanically intact as-deposited Black Al films are thermally stable up to temperatures of at least 400 °C. © 2021 Wiley-VCH GmbH.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

21001 - Nano-materials (production and properties)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physica Status Solidi (b)

ISSN

0370-1972

e-ISSN

—

Svazek periodika

neuveden

Číslo periodika v rámci svazku

December 2021

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

7

Strana od-do

—

Kód UT WoS článku

000736096800001

EID výsledku v databázi Scopus

2-s2.0-85122022586