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Title: Transistor-Based Work-Function Measurement of Metal–Organic Frameworks for Ultra-Low-Power, Rationally Designed Chemical Sensors

Journal Article · · Chemistry - A European Journal
ORCiD logo [1];  [2];  [3];  [4];  [5]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering and Berkeley Sensor & Actuator Center
  2. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry and Berkeley Sensor & Actuator Center
  3. Univ. of California, Berkeley, CA (United States). Dept. of Electrical Engineering and Computer Sciences and Berkeley Sensor & Actuator Center
  4. National Tsing Hua Univ., Hsinchu (Taiwan). Dept. of Materials Science and Engineering; Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering and Berkeley Sensor & Actuator Center
  5. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry

A classic challenge in chemical sensing is selectivity. Metal–organic frameworks (MOFs) are an exciting class of materials because they can be tuned for selective chemical adsorption. Adsorption events trigger work-function shifts, which can be detected with a chemical-sensitive field-effect transistor (power ≈microwatts). Here, several case studies were used towards generalizing the sensing mechanism, ultimately towards our metal-centric hypothesis. HKUST-1 was used as a proof-of-principle humidity sensor. The response is thickness independent, meaning the response is surface localized. ZIF-8 is demonstrated to be an NO2-sensing material, and the response is dominated by adsorption at metal sites. Finally, MFM-300(In) shows how standard hard–soft acid–base theory can be used to qualitatively predict sensor responses. This paper sets the groundwork for using the tunability of metal–organic frameworks for chemical sensing with distributed, scalable devices.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1638198
Alternate ID(s):
OSTI ID: 1562127
Journal Information:
Chemistry - A European Journal, Vol. 25, Issue 57; ISSN 0947-6539
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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