Vertical SnSe nanorod arrays: from controlled synthesis and growth mechanism to thermistor and photoresistor

• Published in: Nanotechnology 2014-03, Vol.25 (10), p.105705-105705
• Main Authors: Cao, Jinli, Wang, Zhenxing, Zhan, Xueying, Wang, Qisheng, Safdar, Muhammad, Wang, Yajun, He, Jun
• Format: Article
• Language: English
• Subjects: Arrays; Catalytic methods; Chemical vapor deposition; Chemical vapor deposition (including plasma-enhanced cvd, mocvd, etc.); Cross-disciplinary physics: materials science; rheology; Devices; Exact sciences and technology; Materials science; Methods of deposition of films and coatings; film growth and epitaxy; Methods of nanofabrication; Nanocrystalline materials; Nanoscale materials and structures: fabrication and characterization; Nanostructure; Nanotechnology; Nanotubes; negative temperature coefficient resistance; photoresponse; Physics; Silver; thermistor; Thermistors; tin selenide; vertical growth
• ISSN: 0957-4484; 1361-6528
• DOI: 10.1088/0957-4484/25/10/105705

We demonstrate that high-quality vertically aligned SnSe nanorod (NR) arrays have been synthesized via a facile chemical vapor deposition method on SiO2 substrates using Bi powder as catalysts. Both SEM and TEM measurements reveal that this kind of SnSe NR consists of a one-dimensional core and dense two-dimensional branches. Thermistors and photoresistors have been fabricated in situ by directly depositing silver paint on the growth substrates. The thermistor shows the great merits of a broad temperature range (77−390 K), linear input-output characteristic, suitable thermal index and high sensitivity. The photoresistor device exhibits relatively fast response time, linear input-output, high reversibility and stability. In addition, both of the devices have the advantages of low cost, environment-friendliness and easy fabrication. The high performance of SnSe thermistors and photodetectors will make SnSe material promising in industrial multi-function nanodevices.